Optical Illusions

The first one is just confusing and annoying, not being able to see all the dots. Second one is interesting, and third one is quite hard.
 
http://www.voidgamers.com/channel/HirstArts/HADD7/b.356.r.386.html

A guy made a 3D version of a M.C. Eshers painting.

ABAROTH-Ascend1small.jpg
 
Borders and Framing Color

Colors often appear brighter and more vibrant when they are bordered by frames. Black lines are commonly used to enhance colors in applications like stained glass. This tactic creates a certain effect, as shown below, and prevents color clashing. Notice that the drawing on the left colors appear significantly brighter and pure.
 
The one on the right is also a bit harder to look at.
 
No other angles just close ups of details.
 
I've checked out some of the pics, I think I can see where the trick is.
 
That one in the last thread with the checkerboard and the green cube was the single best optical illusion I've ever seen.

EDIT: here it is
The thing is, squares A and B are the same shade. Open it up in paint and put the two squares together side by side and see for yourself.
checkershadow.jpg
 
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