CSS Optical Illusions

9 comments

• myfonj7 hours ago
  These &quot;dots appearing only while (not) focused&quot; are known as &quot;extinction illusions&quot;, namely<p><pre><code> &quot;25 - Appearing Dots&quot; </code></pre> is &quot;McAnany&#x27;s type&quot; [1], and<p><pre><code> &quot;26 - Disappearing Dots&quot; </code></pre> is known as &quot;Ninio&#x27;s type&quot; [2], according Akiyoshi Kitaoka&#x27;s materials. (I have recreated them too few years ago [3][4], before getting to the source.)<p>[1] <a href="https:&#x2F;&#x2F;www.psy.ritsumei.ac.jp&#x2F;akitaoka&#x2F;kieru3e.html#:~:text=McAnany%27s%20typeMcAnany" rel="nofollow">https:&#x2F;&#x2F;www.psy.ritsumei.ac.jp&#x2F;akitaoka&#x2F;kieru3e.html#:~:text...</a><p>[2] <a href="https:&#x2F;&#x2F;www.psy.ritsumei.ac.jp&#x2F;akitaoka&#x2F;kieru3e.html#:~:text=Ninio%27s%20type" rel="nofollow">https:&#x2F;&#x2F;www.psy.ritsumei.ac.jp&#x2F;akitaoka&#x2F;kieru3e.html#:~:text...</a><p>[3] <a href="https:&#x2F;&#x2F;codepen.io&#x2F;myf&#x2F;full&#x2F;XjdmJy" rel="nofollow">https:&#x2F;&#x2F;codepen.io&#x2F;myf&#x2F;full&#x2F;XjdmJy</a> ( scintillation warning)<p>[4] <a href="https:&#x2F;&#x2F;codepen.io&#x2F;myf&#x2F;full&#x2F;jMqoMW" rel="nofollow">https:&#x2F;&#x2F;codepen.io&#x2F;myf&#x2F;full&#x2F;jMqoMW</a> ( scintillation warning)
• brandon_bot2 hours ago
  Cool!<p>I did something similar for my personal favorite illusion, the Ames window illusion. Recreated with CSS: <a href="https:&#x2F;&#x2F;brandondong.github.io&#x2F;blog&#x2F;ames_window&#x2F;" rel="nofollow">https:&#x2F;&#x2F;brandondong.github.io&#x2F;blog&#x2F;ames_window&#x2F;</a>
• sandpaper269 hours ago
  This is cool, but more as a demonstration of interesting CSS techniques than optical illusions in my opinion.<p>Also, interestingly, I seem to be able to force myself to &quot;see through&quot; all of these illusions except for induced gradients, which I can&#x27;t stop seeing unless I cover part of the screen.
• nilslindemann9 hours ago
  33 - color fan: There is another interesting optical illusion here: The fan seems to rotate faster when not directly looking at it.
• layer84 hours ago
  Heh, I used to do these in Excel.
• eulgro3 hours ago
  They could make capchas out of these.
• encom9 hours ago
  These are all super dark, for some reason.
  • christophilus8 hours ago
    You have to actually run them. Otherwise, they&#x27;re just a dark CodePen preview.
    • encom8 hours ago
      Why the extra step of having to click each one? Only a few of them are interactive.
      • d-us-vb7 hours ago
        Because codepens can run javascript. And if a page has 50 of them, it might make the page load time much longer. I know that all these examples are pure CSS, and maybe there is a setting in codepen to disable the &quot;Run&quot; button and automatically run it. Still, getting to decide is generally a better pattern than presuming that that&#x27;s what the user wants, especially when the fact that the code is inside a codepen makes it explicitly not an integral function of the page. &quot;I thought this was just a blog, and now you want me to run all this javascript??&quot; -- some JS hater, probably.<p>I appreciate getting to choose as much as possible when code runs.
        • zamadatix7 hours ago
          Somewhat ironically, Codepen ended up introducing the JS execution requirement to view the content.
• moralestapia9 hours ago
  Wow, this is great!<p>I want to put some of them in my UIs.
  • herpdyderp6 hours ago
    I&#x27;ve often run into these unintentionally messing up my UIs!