{"id":975,"date":"2010-02-26T12:01:32","date_gmt":"2010-02-26T01:01:32","guid":{"rendered":"http:\/\/hifi-writer.com\/wpblog\/?p=975"},"modified":"2010-02-26T10:12:06","modified_gmt":"2010-02-25T23:12:06","slug":"the-flexible-eye-again","status":"publish","type":"post","link":"https:\/\/hifi-writer.com\/wpblog\/?p=975","title":{"rendered":"The flexible eye again"},"content":{"rendered":"<p>From <a href=\"http:\/\/hifi-writer.com\/wpblog\/?p=973\">another old post<\/a>, but I thought I&#8217;d actually include the picture this time, since <a href=\"http:\/\/web.mit.edu\/persci\/people\/adelson\/checkershadow_illusion.html\">the source website <\/a>says &#8216;These checkershadow images may be reproduced and distributed freely&#8217;.<\/p>\n<p><a href=\"http:\/\/hifi-writer.com\/wpblog\/wp-content\/uploads\/2010\/02\/checkershadow_illusion4med.jpg\"><img loading=\"lazy\" class=\"aligncenter size-full wp-image-976\" title=\"checkershadow_illusion4med\" src=\"http:\/\/hifi-writer.com\/wpblog\/wp-content\/uploads\/2010\/02\/checkershadow_illusion4med.jpg\" alt=\"\" width=\"540\" height=\"420\" srcset=\"https:\/\/hifi-writer.com\/wpblog\/wp-content\/uploads\/2010\/02\/checkershadow_illusion4med.jpg 540w, https:\/\/hifi-writer.com\/wpblog\/wp-content\/uploads\/2010\/02\/checkershadow_illusion4med-300x233.jpg 300w\" sizes=\"(max-width: 540px) 100vw, 540px\" \/><\/a><\/p>\n<p>The squares marked A and B are the same level or brightness as each other, regardless of what your eyes are telling you. Copy and paste into some graphics software and check for yourself if you don&#8217;t believe me.<\/p>\n<p>Or from the same site, see an animated example showing the same kind of thing. First, go to the <a href=\"http:\/\/web.mit.edu\/persci\/gaz\/\">Lightness Perception and Lightness Illusions <\/a>site, then click on &#8216;download the PDF version&#8217;, making sure you have popups allowed. In the resulting window, scroll down and choose &#8216;The Koffka Ring&#8217;. This is perhaps even more starling, especially the &#8216;shifted&#8217; version.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>From another old post, but I thought I&#8217;d actually include the picture this time, since the source website says &#8216;These checkershadow images may be reproduced and distributed freely&#8217;. The squares marked A and B are the same level or brightness &hellip; <a href=\"https:\/\/hifi-writer.com\/wpblog\/?p=975\">Continue reading <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[47,24],"tags":[],"_links":{"self":[{"href":"https:\/\/hifi-writer.com\/wpblog\/index.php?rest_route=\/wp\/v2\/posts\/975"}],"collection":[{"href":"https:\/\/hifi-writer.com\/wpblog\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/hifi-writer.com\/wpblog\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/hifi-writer.com\/wpblog\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/hifi-writer.com\/wpblog\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=975"}],"version-history":[{"count":3,"href":"https:\/\/hifi-writer.com\/wpblog\/index.php?rest_route=\/wp\/v2\/posts\/975\/revisions"}],"predecessor-version":[{"id":979,"href":"https:\/\/hifi-writer.com\/wpblog\/index.php?rest_route=\/wp\/v2\/posts\/975\/revisions\/979"}],"wp:attachment":[{"href":"https:\/\/hifi-writer.com\/wpblog\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=975"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/hifi-writer.com\/wpblog\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=975"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/hifi-writer.com\/wpblog\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=975"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}