Jeff Epler's blog2005-11-07T19:12:26ZPhotos, electronics, cnc, and moreJeff Eplerjepler@unpythonic.netTwo optical illusions2005-11-07T19:12:26Z2005-11-07T19:12:26Zhttps://gamma.unpythonic.net/01131390746-two-optical-illusions
These optical illusions almost certainly aren't new, but I discovered them
for myself when some application accidentally exhibited similar behavior.
<p>For the <a href="https://media.unpythonic.net/emergent-files/01131390746-two-optical-illusions/anim.gif">first illusion</a>, stare at the black dot.
Eventually, the moving bar at the left side will appear to change color from
grey to blue.
<p>For the <a href="https://media.unpythonic.net/emergent-files/01131390746-two-optical-illusions/oo.html">second illusion</a>, point at the white page
background and concentrate on the blue square for several seconds. Without
moving your eyes, move the mouse pointer onto the square, which will change
color. Initially, the rectangle will appear to be white just like the
background, or as even a brighter white. After a few seconds it will "fade"
to be the grey it truly is. This seems to work better if the window
is maximized.