Optical illusions
IV
It appears that a = d or b = c in brightness, but
actually b = d.
 
The blue circles in the upper half appear to be
different in color
from those in the lower half, though they are identical in color. 
The left ring appears to rotate counterclockwise
while the right one clockwise.
The yellow dots placed off the center of sight
appear to vanish.
Each column of buttons appears to move
vertically.
The image appears to wave.
 Seems like they're spinning, doesn't it?
The left red appears to be magenta while the
right
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