Can we believe our eyes?

Optical illusion

Sometimes our brain misunderstands the message which comes from our eyes and we ‘see’ something different from what is really there. We call that an ‘optical illusion’

There are three main types: literal optical illusions that create images that are different from the objects that make them, physiological ones that are the effects on the eyes and brain of excessive stimulation of a specific type (brightness, tilt, color, movement), and cognitive illusions where the eye and brain make unconscious inferences. They can also be known as "mind games".

Most of the people see a donkey first, but if you look closer you'll find a seal, with its flippers where the donkey's ears are!