It's an experience that can be artificially induced! Here's how. Ever felt a word was right on the Tip of Your Tongue, but just couldn't think of it? It's a strange, frustrating experience across cultures - and all over the world.Hit the dots and discover your mental reaction time. Your goal: mental concordance with other Web surfers.

Test your group-telepathy with a random sequence generator.Stare at the pattern and make a suggestion.Two methods in sensory stimulation show how ephemeral your body image is and how easily it can be distorted. Experience the uncanny illusion of having an extra limb attached to your body.Experience the subliminal in the sublime in these natural human art forms! See this stunning display of Hand Shadow Illusions cast upon a wall.Words are flashed across your consciousness: which ones do you detect, and why? Click here to see the panel!.Four simple questions designed to stump you.

What do these ten words have in common? Click here for more info.

You can perform up to a maximum of three weighings to find out which marble has the different weight, and if it is heavier or lighter than the others. You don't know if that one is heavier or lighter.

Which day of the week is an anagram for a common noun? Click here for the answer!.

The object is to reposition two - and only two - sticks so that you have exactly four squares of equal size and no sticks left over.

Astonishing Optical Illusions - each one different, unique, and fun.

Illusion games website