Another type of illusion is an impossible object. Although an impossible object initially looks normal, upon close observation, you will notice that your brain has tried to make sense out of an impossible object. Click here to see an example of an impossible object. Illusions also come in a form called ambiguity. In these illusions, your brain must choose which interpretation is correct.
Distortion illusions are ones which alter an image's size, shape, and length.
Often times, a funhouse will use these illusions to confuse your perception. Click here to view one type of distortion illusion. Animals and plants use a type of illusion called camouflage. This illusion allows them to blend in with their environment. Often times this is most effective if the animal does not move.