Art transports our minds beyond the reality of the physical medium such as a canvas to invoke concepts, senses and emotions. Therefore it is possible to think of all art as optical illusion. However, some art takes this a step further by deliberately tricking out brains to see that which is not really there. This may involve:
excessive stimulation by color, tilt or brightness etc..
(the orange lines are parallel to one another)
making images from objects, people etc....
cognitive illusions that trick the brain with unconscious suggestions
Moving optical illusions are usually physiological meaning that they overload the capacity of our eyes and brain with excessive stimulation such as repetitive patterns, brightness, angle, contrast etc..