Perception.

How the brain experience the world of objects through information from the senses-sight,hearing,taste,smell and touch.Forms of study of perception.
Perception has evolved from the reflexes of the most primitive animals,and is also prsent to some degree in plants,many of wich sense gravity to grow upright and grow towards sunlight,some even have touch-sensitive tendrils.

Illusions
Perceptions can be wrong,leading to theexperience of illusions.Some illusions are due t physiological abnormalities wich may be permanent but are usually temporarysuch as the after images that result fromseeing a bright light that fatigues or adapts retinal receptor cells.Altenatively an illusion may be due to the coded signals from the senses being misread,due to the fact that sensory signals are ambiguous.

Here are some samples of illusions.

Ambiguities:A meaningful picture will probably perceived when the drawing above is first seen.but it may be then be abruptly replace by another image.It is not known why the image of a vase first appears to some people and that of two faces to other people,nor is the reason for the sudden change clear

Here is another one

The cube above appears to change orientation when looked at continously.

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