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Mental Exercises:
12 Best mental exercises   
Mind-boggling puzzles   
Mathematical puzzles   
Miscellaneous puzzles   
Logical paradoxes or fallacies   
Synchronic thinking   
Multi-dimensional   
** Optical illusion **
Motion
illusion
Café
Wall
Perspective
Ponzo
Ebbinghaus
illusion
Checker
Shadow
Munker-
White
Cornsweet
illusion
Figure-
Ground
Grid
illusion
Illusory
Contours
Neon
Color
Miscellaneous
illusion
Beta
movement
Phi
phenomenon
After-
image
McCollough
effect
Spinning
Dancer
3D-
illusion
Trompe
l'oeil
Auto-
stereogram
3D
Street
3D
Pencil
3D
Computer
3D
Artworks
3D street art
by Edgar Mueller  
3D street art
by Julian Beever  
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