About me I've been a computer programmer since I first started typing in program listings on a Commodore Vic 20 when I was about 8. My hobbies include electronics, CNC manufacturing, photography, beer and winemaking.
I live with my wife and lots of left-over parts from unfinished projects in Lincoln, Nebraska, USA.]
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7 November 2005, 19:12 UTCTwo optical illusions
These optical illusions almost certainly aren't new, but I discovered them
for myself when some application accidentally exhibited similar behavior.
For the first illusion, stare at the black dot.
Eventually, the moving bar at the left side will appear to change color from
grey to blue.
For the second illusion, 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.
Two optical illusions
These optical illusions almost certainly aren't new, but I discovered them for myself when some application accidentally exhibited similar behavior.
For the first illusion, stare at the black dot. Eventually, the moving bar at the left side will appear to change color from grey to blue.
For the second illusion, 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.
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