optical illusions, puzzles, brain teasers

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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.
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Four Squares Problem

The object is to reposition two -- and only two -- sticks, so that you end up with four squares of equal size and no sticks left over.

For the answer, click here.

Here is the Answer:

First: slide the second top horizontal stick in the upper row horizontally to the right (its own length in distance). Second: place the second horizontal bottom stick (in the lower row) so that it is now perpendicular to the stick you just moved. See picture below.

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