Perception is the process of interpreting and understanding sensory information. It is an act of sensing that information then interpreting it. One of the cue’s in the environment that aid perception are affordances. These are clues in the environment such as optic flow, relative brightness, texture and size and they help to process what we see.
Gibson argues that Gregory’s use of visual illusions to prove his top- down theory are artificial as they are not images found in our normal visual environments. Perception is direct and we can make sense of the world with the information that we already have. This is widely argued because many illusions are encountered in the environment, for example when looking at a waterfall for a long time, then moving the eyes to a stationary objects, the stationary object seems to move in the opposite direction.
Optical illusions come in different forms, from seeing moving things in a still picture, seeing two different objects within the same picture to magic eyes.
Some optical illusions come from chalk drawings in the street, these are visible though our perception which makes the drawing seem 3D.
google images – optical illusion chalk drawings.
Here are some other illusions to try for yourself. Aswell as some web links. Thanks for reading…Have fun