Optical illusions

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A random collection of interesting optical illusions and other strange visual stuff

Click on the images to see larger versions.

Quickly...Name the colours that the words are written in. Don't read the words - just name the colours your see. Six year old children can do this easily - and find it hilarious that adults have such a hard time of it!
Focus your eyes in the dot in the middle. Move your head towards and away from the screen. Freaky!
Aren't these two triangles the same size? Then how come the bottom one has room for the pink square?