Recently I grew interest in optical illusions and did some research.
Optical illusion is obtained in a lot of different ways.
Motion and time
This form of illusion is caused by using the characteristics of colours and move round with them.
(As i do not know how to upload an flsh document so i would not be uploading any examples.)
Luminance and contrast
By using the contrasting colours, the images create illusions to the eyes
Colour illusions are caused by the playing around with colours. (Obviously) It uses colours of similar pigments to create illusions of other colours.
Angle and geometric illusions
Space, 3D and Size constancy
Cognitive -/Gestalt effect
Specialties with faces
All above are the topics of visual illusions
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