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NIEHS Kids Page -- Optical Illusions - StumbleUpon
Gotcha! But the rest of these optical illusions are on the level. What are illusions? Illusions trick us into perceiving something differently than it actually exists, so what we see does not correspond to physical reality. Hence, the word illusion comes from the Latin verb illudere meaning, "to mock."Knoword is a game of quick thinking, smart decisions and great words. When you begin, you will be given one randomly generated dictionary definition along with the first letter of its corresponding word. You must fill in the rest of the word to experience a gain in points and an added time bonus. You will start off with one minute before the game ends, and every word is an opportunity to extend your time. If you're ever stuck on a word, just hit the skip button and a new puzzle will present itself. If you're able to string together correct answers, you will notice your Word streak counter increasing.
