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You see these optical illusion illustrations. I think this is one of the better ones. Do you see a spiral below?
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There is no spiral. There are only concentric circles. If you follow the "spiral" with your mouse you can verify that they are circles. It's called the Fraser Illusion.
Hide the shrooms !
I can see these spirals in thin air, especially if I stare too long at my computer screen.
This one surprised me even more.
Is square A or square B darker?
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Both squares are exactly the same shade of grey. I didn't believe it so I took a screenshot and pasted into Paint and cropped the two squares separately and compared them. They are indeed the exact same shade of grey.
Damn. Even doing the same thing as you (copying out the b-square) and placing outside the board, I still couldn't believe my eyes were telling me they were different shades. For fun, I centered the copied tile vertically above the board and slowly slid it downwards to overlap the b-tile. The colors magically "lightened up" as I got closer to the b-tile. Things like this are very cool mind bendersQuote:
Originally Posted by EntityX
Here's the two squares cropped individually in Paint next to each other. It must be the shadow of the cyllinder that somehow throws the comparison off but I can't say that I really understand it.
Me neither. Curious whether the shape of the shadow source is a player? What about the color of the source/cylinder?Quote:
Originally Posted by EntityX
Well, it's definitely the surrounding tiles that force the illusion. I tried copying the a-tile to all the surrounding white blocks & the b-tile still appeared, visually, as lighter, but not as light as before. Then I surrounded all the adjacent tiles to the b-tile with the a-tile copy and illusion is gone... the b-tile below was not modified at all
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Very interesting. Your image shows that both tiles are the same shade. It also demonstrates that what is immediately surrounding the tiles affects your perception of the tiles' color and/or shade.
I found something about this illusion.
http://www.michaelbach.de/ot/lum_ade...dow/index.html
There's an explanation link given by the creator of the illustration.