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optical illusions
Brain Teasers - Optical Illusions
straight or curved lines?

Task - Are the lines in the image curved or straight?

left to right brain conflict Task - Seems simple. In fact, its nigh impossible
count the black dots Task - Try and count the black dots on the grey lines
focus on square Task - Focus on the square in the middle of the image. It seems to move!
spiral or circles Task - Your first impression will be of a spiral. Look a little closer.
geometry trick Task - Basic Geometry. How is this possible? Answers on a postcard.
disappearing pink dot illusion Task - Focus on the cross in the middle. Eventually the pink dots will disappear
square of diamond illusion Task - Do you see squares of diamonds?
vase or lovers illusion Task - Lovers or a vase?