Here's an optical illusion. Look at the square with the A and the square with the B. A appears to be darker than B, right?
(https://i133.photobucket.com/albums/q75/djmillerbucket/oddsnends/checkershadow_illusion4med.jpg)
It's not. The 2 squares are actually the same shade of gray. I didn't believe it myself so I opened the image in Photoshop and copied a section from A and a section from B. I pasted the pieces into a new image and here it is. I enlarged the image by a factor of 2. No other tricks. It's all in your head.
(https://i133.photobucket.com/albums/q75/djmillerbucket/oddsnends/ABcopied.jpg)
nawww, still doesn't seem possible! :-?
Honest. The mind is a scary place!
It is hard to believe... We do like to trust our eyes (seeing is believing and all that :-[).
I enlarged the image and still couldn't see it. But - here are two selective patches copied into the same image.
(https://i56.photobucket.com/albums/g166/jraabe/image2.jpg)
If you squint your eyes real tight ---
to real tiny slits
so little light gets through
and stare at it for a few seconds
you can see that
the colors are
the
same.
8-)
Don't you think
other
people in
the room
watching you
do this
think
you look
real stupid? :)
Like--- what the hell is he/she on?? ;D
It's something to do with the brain recognizing the pattern and needing to make it work. That shadow gets it confused. Or something along those lines. Weird and cool.