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There are a few of these sorts of optical illusions on the web – a simple image of two people embracing throws your brain into confusion where the couple are at strange angles and it's hard to immediately decipher which head (or other body part) belongs to which person.

Optical illusions can be of three main types. The first are Literal Illusions that produce images in contrast to the objects used. Second are dubbed Physiological Illusions that are created in the human mind due to excessive stimulation. The last type of illusions is Cognitive which is a result of unconscious presumptions of the human brain.