The Necker Cube, an optical illusion. See how the Cube "mysteriously" changes perspective while you watch.

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Applet Author: Mark Newbold
Quick LinksMind Bluff Links
Optical IllusionsA cross-section of different themes designed to fool the mind.
Four Squares ProblemReposition 2 sticks so that you have four squares of equal size and no sticks left over.
Marble-Weighing Problem12 marbles all weigh the same except one. Perform a maximum of three weighings to find the odd man out. Mensa-level test.
Fast QuestionsFour simple questions designed to stump you.
Speed PanelWords are flashed at subliminal speed: Which ones do you detect, and why?
Hand Shadow IllusionsHand Shadows cast upon a wall. Experience these cool human art forms!
Speed Reading TestsCompute reading speed and comprehension scores in these timed and untimed reading tests.
Reaction Time TestHit the dots and discover your mental reaction time. 30-second test.
Create a Fake Phantom LimbExperience the illusion of a tactile limb attached to your body.
When Words CollideWords can be illusions -- in the guise of puns. Enter a landscape of double meanings.
More StuffMUCH MORE content on the main page!