{"version":"1.0","provider_name":"Museum of illusions Krakow","provider_url":"https:\/\/dev.krakil.pl\/en\/","author_name":"mgrbac","author_url":"https:\/\/dev.krakil.pl\/en\/author\/mgrbac\/","title":"Optical illusions - Museum of illusions Krakow","type":"rich","width":600,"height":338,"html":"<blockquote class=\"wp-embedded-content\" data-secret=\"313vVkf7uT\"><a href=\"https:\/\/dev.krakil.pl\/en\/exhibition\/optical-illusions\/\">Optical illusions<\/a><\/blockquote><iframe sandbox=\"allow-scripts\" security=\"restricted\" src=\"https:\/\/dev.krakil.pl\/en\/exhibition\/optical-illusions\/embed\/#?secret=313vVkf7uT\" width=\"600\" height=\"338\" title=\"&#8220;Optical illusions&#8221; &#8212; Museum of illusions Krakow\" data-secret=\"313vVkf7uT\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\" class=\"wp-embedded-content\"><\/iframe><script type=\"text\/javascript\">\n\/*! This file is auto-generated *\/\n!function(c,d){\"use strict\";var e=!1,o=!1;if(d.querySelector)if(c.addEventListener)e=!0;if(c.wp=c.wp||{},c.wp.receiveEmbedMessage);else if(c.wp.receiveEmbedMessage=function(e){var t=e.data;if(!t);else if(!(t.secret||t.message||t.value));else if(\/[^a-zA-Z0-9]\/.test(t.secret));else{for(var r,s,a,i=d.querySelectorAll('iframe[data-secret=\"'+t.secret+'\"]'),n=d.querySelectorAll('blockquote[data-secret=\"'+t.secret+'\"]'),o=new RegExp(\"^https?:$\",\"i\"),l=0;l<n.length;l++)n[l].style.display=\"none\";for(l=0;l<i.length;l++)if(r=i[l],e.source!==r.contentWindow);else{if(r.removeAttribute(\"style\"),\"height\"===t.message){if(1e3<(s=parseInt(t.value,10)))s=1e3;else if(~~s<200)s=200;r.height=s}if(\"link\"===t.message)if(s=d.createElement(\"a\"),a=d.createElement(\"a\"),s.href=r.getAttribute(\"src\"),a.href=t.value,!o.test(a.protocol));else if(a.host===s.host)if(d.activeElement===r)c.top.location.href=t.value}}},e)c.addEventListener(\"message\",c.wp.receiveEmbedMessage,!1),d.addEventListener(\"DOMContentLoaded\",t,!1),c.addEventListener(\"load\",t,!1);function t(){if(o);else{o=!0;for(var e,t,r,s=-1!==navigator.appVersion.indexOf(\"MSIE 10\"),a=!!navigator.userAgent.match(\/Trident.*rv:11\\.\/),i=d.querySelectorAll(\"iframe.wp-embedded-content\"),n=0;n<i.length;n++){if(!(r=(t=i[n]).getAttribute(\"data-secret\")))r=Math.random().toString(36).substr(2,10),t.src+=\"#?secret=\"+r,t.setAttribute(\"data-secret\",r);if(s||a)(e=t.cloneNode(!0)).removeAttribute(\"security\"),t.parentNode.replaceChild(e,t);t.contentWindow.postMessage({message:\"ready\",secret:r},\"*\")}}}}(window,document);\n<\/script>\n","thumbnail_url":"https:\/\/dev.krakil.pl\/wp-content\/uploads\/2020\/07\/www.nowelski.pl-6-blurred.jpg","thumbnail_width":2556,"thumbnail_height":1220,"description":"It\u2019s a bird! It\u2019s a plane! No, it\u2019s\u2026 an illusion! Optical (also known as visual) illusions love to play tricks on you by showing something that isn\u2019t there. Or is it? They work by using imperfections or specifics of the visual system to create an image that is different from reality. Why does that happen? [&hellip;]"}