{"id":2669,"date":"2023-08-20T18:00:18","date_gmt":"2023-08-20T18:00:18","guid":{"rendered":"https:\/\/tekmonk.edu.vn\/bio\/optical-illusion-brain-challenge-if-you-have-sharp-eyes-find-the-number-7-among-4-in-15-secs\/"},"modified":"2023-08-20T18:00:18","modified_gmt":"2023-08-20T18:00:18","slug":"optical-illusion-brain-challenge-if-you-have-sharp-eyes-find-the-number-7-among-4-in-15-secs","status":"publish","type":"post","link":"https:\/\/tekmonk.edu.vn\/bio\/optical-illusion-brain-challenge-if-you-have-sharp-eyes-find-the-number-7-among-4-in-15-secs\/","title":{"rendered":"Optical Illusion Brain Challenge: If you have Sharp Eyes Find the Number 7 among 4 in 15 Secs"},"content":{"rendered":"\n\n<div class=\"kk-star-ratings kksr-auto kksr-align-left kksr-valign-top\"\n    data-payload='{&quot;align&quot;:&quot;left&quot;,&quot;id&quot;:&quot;2669&quot;,&quot;slug&quot;:&quot;default&quot;,&quot;valign&quot;:&quot;top&quot;,&quot;ignore&quot;:&quot;&quot;,&quot;reference&quot;:&quot;auto&quot;,&quot;class&quot;:&quot;&quot;,&quot;count&quot;:&quot;0&quot;,&quot;legendonly&quot;:&quot;&quot;,&quot;readonly&quot;:&quot;&quot;,&quot;score&quot;:&quot;0&quot;,&quot;starsonly&quot;:&quot;&quot;,&quot;best&quot;:&quot;5&quot;,&quot;gap&quot;:&quot;5&quot;,&quot;greet&quot;:&quot;Rate this post&quot;,&quot;legend&quot;:&quot;0\\\/5 - (0 votes)&quot;,&quot;size&quot;:&quot;24&quot;,&quot;title&quot;:&quot;Optical Illusion Brain Challenge: If you have Sharp Eyes Find the Number 7 among 4 in 15 Secs&quot;,&quot;width&quot;:&quot;0&quot;,&quot;_legend&quot;:&quot;{score}\\\/{best} - ({count} {votes})&quot;,&quot;font_factor&quot;:&quot;1.25&quot;}'>\n            \n<div class=\"kksr-stars\">\n    \n<div class=\"kksr-stars-inactive\">\n            <div class=\"kksr-star\" data-star=\"1\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"2\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"3\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"4\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" data-star=\"5\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n    <\/div>\n    \n<div class=\"kksr-stars-active\" style=\"width: 0px;\">\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n            <div class=\"kksr-star\" style=\"padding-right: 5px\">\n            \n\n<div class=\"kksr-icon\" style=\"width: 24px; height: 24px;\"><\/div>\n        <\/div>\n    <\/div>\n<\/div>\n                \n\n<div class=\"kksr-legend\" style=\"font-size: 19.2px;\">\n            <span class=\"kksr-muted\">Rate this post<\/span>\n    <\/div>\n    <\/div>\n<p>If you are a keen observer try to find the Number 7 in this Optical Illusion. It is time to put your eyes to the test and know how good your perception is!<br \/> Visit our website NEWSTARS Education to unravel the secrets behind mind-boggling and Expand your knowledge, engage your senses, and explore the fascinating world of visual perception at our website NEWSTARS Education.<\/p><div id=\"ez-toc-container\" class=\"ez-toc-v2_0_52 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title \" >Table of Contents<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table of Content\" role=\"button\"><label for=\"item-69d95c37cbe73\" ><span class=\"\"><span style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewBox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewBox=\"0 0 24 24\" version=\"1.2\" baseProfile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/label><input aria-label=\"Toggle\" aria-label=\"item-69d95c37cbe73\"  type=\"checkbox\" id=\"item-69d95c37cbe73\"><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1 ' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/tekmonk.edu.vn\/bio\/optical-illusion-brain-challenge-if-you-have-sharp-eyes-find-the-number-7-among-4-in-15-secs\/#The_Science_Behind_Optical_Illusion\" title=\"The Science Behind Optical Illusion\">The Science Behind Optical Illusion<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/tekmonk.edu.vn\/bio\/optical-illusion-brain-challenge-if-you-have-sharp-eyes-find-the-number-7-among-4-in-15-secs\/#What_are_the_Different_Types_of_Optical_Illusion\" title=\"What are the Different Types of Optical Illusion?\">What are the Different Types of Optical Illusion?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/tekmonk.edu.vn\/bio\/optical-illusion-brain-challenge-if-you-have-sharp-eyes-find-the-number-7-among-4-in-15-secs\/#Number_7_Optical_Illusion\" title=\"Number 7 Optical Illusion\">Number 7 Optical Illusion<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/tekmonk.edu.vn\/bio\/optical-illusion-brain-challenge-if-you-have-sharp-eyes-find-the-number-7-among-4-in-15-secs\/#Where_is_the_Number_7_in_this_Optical_Illusion\" title=\"Where is the Number 7 in this Optical Illusion?\">Where is the Number 7 in this Optical Illusion?<\/a><\/li><\/ul><\/nav><\/div>\n\n<h2><span class=\"ez-toc-section\" id=\"The_Science_Behind_Optical_Illusion\"><\/span><span id=\"The_Science_Behind_Optical_Illusion\">The Science Behind Optical Illusion<\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>When you hear the word optical illusion, the first thing that might pop up in your mind is what exactly it means. An optical illusion occurs when you see something different from what the object really is. There are many types of optical illusions. Literal optical illusions are usually produced by putting together a collection of numerous images.<\/p>\n<p>Physiological illusions cause someone to see parts of an image that are not actually there. Cognitive illusions create optical illusions using a person&rsquo;s assumptions about the world. This article also contains a unique optical illusion to test your vision. So, let&rsquo;s get started!<\/p>\n<h2><span class=\"ez-toc-section\" id=\"What_are_the_Different_Types_of_Optical_Illusion\"><\/span><span id=\"What_are_the_Different_Types_of_Optical_Illusion\">What are the Different Types of Optical Illusion?<\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Optical illusions are fascinating visual phenomena that trick our brain into perceiving something that is not actually there or interpreting something differently than it actually is. Here are some different types of optical illusions:<\/p>\n<p>Geometric illusions: These illusions use shapes and patterns to create the impression of depth, movement, or distortion.<\/p>\n<p>Ambiguous illusions: These illusions use images that can be interpreted in multiple ways, leading to confusion or uncertainty about what is actually being seen.<\/p>\n<div style=\"clear:both;margin-top:0em;margin-bottom:1em\"><a href=\"\/optical-illusion-challenge-if-you-have-eagle-eyes-find-the-odd-panda-in-15-seconds\" target=\"_blank\" rel=\"&quot;dofollow&quot; noopener\" class=\"u31b673cd182ecb3a1899f81ef9e2147b\">.u31b673cd182ecb3a1899f81ef9e2147b , .u31b673cd182ecb3a1899f81ef9e2147b .postImageUrl , .u31b673cd182ecb3a1899f81ef9e2147b .centered-text-area { min-height: 80px; position: relative; } .u31b673cd182ecb3a1899f81ef9e2147b , .u31b673cd182ecb3a1899f81ef9e2147b:hover , .u31b673cd182ecb3a1899f81ef9e2147b:visited , .u31b673cd182ecb3a1899f81ef9e2147b:active { border:0!important; } .u31b673cd182ecb3a1899f81ef9e2147b .clearfix:after { content: &#8220;&#8221;; display: table; clear: both; } .u31b673cd182ecb3a1899f81ef9e2147b { display: block; transition: background-color 250ms; webkit-transition: background-color 250ms; width: 100%; opacity: 1; transition: opacity 250ms; webkit-transition: opacity 250ms; background-color: #E67E22; } .u31b673cd182ecb3a1899f81ef9e2147b:active , .u31b673cd182ecb3a1899f81ef9e2147b:hover { opacity: 1; transition: opacity 250ms; webkit-transition: opacity 250ms; background-color: #D35400; } .u31b673cd182ecb3a1899f81ef9e2147b .centered-text-area { width: 100%; position: relative; } .u31b673cd182ecb3a1899f81ef9e2147b .ctaText { border-bottom: 0 solid #fff; color: #ECF0F1; font-size: 16px; font-weight: bold; margin: 0; padding: 0; text-decoration: underline; } .u31b673cd182ecb3a1899f81ef9e2147b .postTitle { color: #2C3E50; font-size: 16px; font-weight: 600; margin: 0; padding: 0; width: 100%; } .u31b673cd182ecb3a1899f81ef9e2147b .ctaButton { background-color: #D35400!important; color: #ECF0F1; border: none; border-radius: 3px; box-shadow: none; font-size: 14px; font-weight: bold; line-height: 26px; moz-border-radius: 3px; text-align: center; text-decoration: none; text-shadow: none; width: 80px; min-height: 80px; background: url(https:\/\/eay4j36dydu.exactdn.com\/wp-content\/plugins\/intelly-related-posts\/assets\/images\/simple-arrow.png)no-repeat; position: absolute; right: 0; top: 0; } .u31b673cd182ecb3a1899f81ef9e2147b:hover .ctaButton { background-color: #E67E22!important; } .u31b673cd182ecb3a1899f81ef9e2147b .centered-text { display: table; height: 80px; padding-left: 18px; top: 0; } .u31b673cd182ecb3a1899f81ef9e2147b .u31b673cd182ecb3a1899f81ef9e2147b-content { display: table-cell; margin: 0; padding: 0; padding-right: 108px; position: relative; vertical-align: middle; width: 100%; } .u31b673cd182ecb3a1899f81ef9e2147b:after { content: &#8220;&#8221;; display: block; clear: both; }<\/p>\n<div class=\"centered-text-area\">\n<div class=\"centered-text\" style=\"float: left\">\n<div class=\"u31b673cd182ecb3a1899f81ef9e2147b-content\"><span class=\"ctaText\">See also<\/span>&nbsp; <span class=\"postTitle\">Optical Illusion Challenge: If you have Eagle Eyes find the Odd Panda in 15 Seconds<\/span><\/div>\n<\/div>\n<\/div>\n<div class=\"ctaButton\"><\/div>\n<p><\/a><\/div>\n<p>Color illusions: These illusions use color and light to create the impression of movement, depth, or contrast.<\/p>\n<p>Motion illusions: These illusions create the impression of movement or motion in a static image.<\/p>\n<p>Tactile illusions: These illusions use touch and texture to create the impression of depth, shape, or movement.<\/p>\n<p>Perceptual illusions: These illusions create the impression of a different size, shape, or color than what is actually there.<\/p>\n<p>Flicker illusions: These illusions create the impression of movement or change through rapidly flickering images or colors.<\/p>\n<p>Afterimage illusions: These illusions create the impression of an image or color lingering in the vision after it has been removed.<\/p>\n<p>Optical illusions can be found in various forms of media, including art, advertising, and entertainment. They are a fascinating way to explore the workings of the brain and perception.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Number_7_Optical_Illusion\"><\/span><span id=\"Number_7_Optical_Illusion\">Number 7 Optical Illusion<\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>Everything is an Illusion. Right? Your eyes are incredible organs. They work in constant unison with your brain, and that is the reason why you see the world as you do. But, sometimes, your eyes might lie to you. Your brain takes control of your entire nervous system. But, sometimes, your eyes can trick your brain into seeing things that aren&rsquo;t as they appear.&nbsp;<\/p>\n<p>Now, let us dive into our Number 7 optical illusion. Test Your IQ By Finding the Number 7 in this Optical Illusion. Observing optical illusions is a fantastic way to train your mind to look beyond plain sight and think outside of the box.&nbsp;<\/p>\n<p>Optical illusions help enhance your cognitive and observational skills. Here is an interesting optical illusion to try that improves your skills. And yes, you are a good observer if you did find the Number 7 in this optical illusion. Take a look at the image given below. What do you see? Can you find the Number 7 in the below image?<\/p>\n<div style=\"clear:both;margin-top:0em;margin-bottom:1em\"><a href=\"\/optical-illusion-brain-challenge-if-you-have-hawk-eyes-find-the-number-88-among-80-in-12-secs\" target=\"_blank\" rel=\"&quot;dofollow&quot; noopener\" class=\"u2e2394aab61d0e3a62ef5bd0e536ba26\">.u2e2394aab61d0e3a62ef5bd0e536ba26 , .u2e2394aab61d0e3a62ef5bd0e536ba26 .postImageUrl , .u2e2394aab61d0e3a62ef5bd0e536ba26 .centered-text-area { min-height: 80px; position: relative; } .u2e2394aab61d0e3a62ef5bd0e536ba26 , .u2e2394aab61d0e3a62ef5bd0e536ba26:hover , .u2e2394aab61d0e3a62ef5bd0e536ba26:visited , .u2e2394aab61d0e3a62ef5bd0e536ba26:active { border:0!important; } .u2e2394aab61d0e3a62ef5bd0e536ba26 .clearfix:after { content: &#8220;&#8221;; display: table; clear: both; } .u2e2394aab61d0e3a62ef5bd0e536ba26 { display: block; transition: background-color 250ms; webkit-transition: background-color 250ms; width: 100%; opacity: 1; transition: opacity 250ms; webkit-transition: opacity 250ms; background-color: #E67E22; } .u2e2394aab61d0e3a62ef5bd0e536ba26:active , .u2e2394aab61d0e3a62ef5bd0e536ba26:hover { opacity: 1; transition: opacity 250ms; webkit-transition: opacity 250ms; background-color: #D35400; } .u2e2394aab61d0e3a62ef5bd0e536ba26 .centered-text-area { width: 100%; position: relative; } .u2e2394aab61d0e3a62ef5bd0e536ba26 .ctaText { border-bottom: 0 solid #fff; color: #ECF0F1; font-size: 16px; font-weight: bold; margin: 0; padding: 0; text-decoration: underline; } .u2e2394aab61d0e3a62ef5bd0e536ba26 .postTitle { color: #2C3E50; font-size: 16px; font-weight: 600; margin: 0; padding: 0; width: 100%; } .u2e2394aab61d0e3a62ef5bd0e536ba26 .ctaButton { background-color: #D35400!important; color: #ECF0F1; border: none; border-radius: 3px; box-shadow: none; font-size: 14px; font-weight: bold; line-height: 26px; moz-border-radius: 3px; text-align: center; text-decoration: none; text-shadow: none; width: 80px; min-height: 80px; background: url(https:\/\/eay4j36dydu.exactdn.com\/wp-content\/plugins\/intelly-related-posts\/assets\/images\/simple-arrow.png)no-repeat; position: absolute; right: 0; top: 0; } .u2e2394aab61d0e3a62ef5bd0e536ba26:hover .ctaButton { background-color: #E67E22!important; } .u2e2394aab61d0e3a62ef5bd0e536ba26 .centered-text { display: table; height: 80px; padding-left: 18px; top: 0; } .u2e2394aab61d0e3a62ef5bd0e536ba26 .u2e2394aab61d0e3a62ef5bd0e536ba26-content { display: table-cell; margin: 0; padding: 0; padding-right: 108px; position: relative; vertical-align: middle; width: 100%; } .u2e2394aab61d0e3a62ef5bd0e536ba26:after { content: &#8220;&#8221;; display: block; clear: both; }<\/p>\n<div class=\"centered-text-area\">\n<div class=\"centered-text\" style=\"float: left\">\n<div class=\"u2e2394aab61d0e3a62ef5bd0e536ba26-content\"><span class=\"ctaText\">See also<\/span>&nbsp; <span class=\"postTitle\">Optical Illusion Brain Challenge: If you have Hawk Eyes Find the Number 88 among 80 in 12 Secs<\/span><\/div>\n<\/div>\n<\/div>\n<div class=\"ctaButton\"><\/div>\n<p><\/a><\/div>\n<p>Suppose you have found the Word Note, Bravo! You have an excellent perception of seeing things, and of course, you are a good observer. If you couldn&rsquo;t find it, no problem. We are here to help you as we provided a solution image below.<\/p>\n<h2><span class=\"ez-toc-section\" id=\"Where_is_the_Number_7_in_this_Optical_Illusion\"><\/span><span id=\"Where_is_the_Number_7_in_this_Optical_Illusion\">Where is the Number 7 in this Optical Illusion?<\/span><span class=\"ez-toc-section-end\"><\/span><\/h2>\n<p>This optical illusion seems hard, but with a little concentration, you can find the Word Note. Not many people can spot the Number 7 at first glance. In fact, it might take some time to understand the picture itself.&nbsp;<\/p>\n<p>So, here is the solution image in which you can see the Number 7 in the highlighted area. Isn&rsquo;t it fun to spot the hidden things? There are many new and unique optical illusions. To try more like this optical illusion, check out our website!<\/p>\n<p><img decoding=\"async\" data-expand=\"600\" class=\"lazyload\" src=\"data:image\/svg+xml;charset=utf-8,%3Csvg xmlns%3D'http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg' viewBox%3D'0 0 1 1'%2F%3E\" data-src=\"https:\/\/external-content.duckduckgo.com\/iu\/?u=https:\/\/img6.fresherslive.com\/latestnews\/2023\/08\/7-64defdbb6824557934595-900.webp\" alt=\"Optical Illusion Brain Challenge: If you have Sharp Eyes Find the Number 7 among 4 in 15 Secs 1\"><\/p>\n<p>Disclaimer: The above information is for general informational purposes only. All information on the Site is provided in good faith, however we make no representation or warranty of any kind, express or implied, regarding the accuracy, adequacy, validity, reliability, availability or completeness of any information on the Site.<\/p>\n<p>Categories: <a data-mil=\"109841\" href=\"\/optical-illusion\/\">Optical Illusion<\/a><br \/> Source: <a data-mil=\"109841\" href=\"\/\">newstars.edu.vn<\/a><\/p>\n<\/p>\n<p>Links: <a href=\"https:\/\/tekmonk.edu.vn\/bio\/optical-illusion-brain-challenge-if-you-have-sharp-eyes-find-the-number-7-among-4-in-15-secs\">Optical Illusion Brain Challenge: If you have Sharp Eyes Find the Number 7 among 4 in 15 Secs &#8211; Tekmonk Bio<\/a>, <a href=\"https:\/\/kungfutv.net\/blog\/optical-illusion-brain-challenge-if-you-have-sharp-eyes-find-the-number-7-among-4-in-15-secs\">Optical Illusion Brain Challenge: If you have Sharp Eyes Find the Number 7 among 4 in 15 Secs &#8211; Kungfutv<\/a>, <a href=\"https:\/\/blogtomoney.com\/optical-illusion-brain-challenge-if-you-have-sharp-eyes-find-the-number-7-among-4-in-15-secs\">Optical Illusion Brain Challenge: If you have Sharp Eyes Find the Number 7 among 4 in 15 Secs &#8211; Blogtomoney<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>If you are a keen observer try to find the Number 7 in this Optical Illusion. It is time to put your eyes to the test and know how good your perception is! Visit our website NEWSTARS Education to unravel the secrets behind mind-boggling and Expand your knowledge, engage your senses, and explore the fascinating [&hellip;] <a class=\"g1-link g1-link-more\" href=\"https:\/\/tekmonk.edu.vn\/bio\/optical-illusion-brain-challenge-if-you-have-sharp-eyes-find-the-number-7-among-4-in-15-secs\/\">More<\/a><\/p>\n","protected":false},"author":1,"featured_media":2670,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[26],"tags":[],"reaction":[],"adace-sponsor":[],"class_list":{"0":"post-2669","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-newstars"},"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.7 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Optical Illusion Brain Challenge: If you have Sharp Eyes Find the Number 7 among 4 in 15 Secs<\/title>\n<meta name=\"description\" content=\"If you are a keen observer try to find the Number 7 in this Optical Illusion. 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