Find a polar equation in r and 
that has the same graph as the equation in x and y. 
Definitions:
Reversible Figure
A visual illusion or ambiguous image designed to be perceived in more than one way, showing different images based on the viewer's perception.
Figure-Ground Distinction
The perceptual separation of an object (the figure) from its background (the ground), a fundamental process in visual perception.
Phi Phenomenon
An optical illusion of perceiving continuous motion between separate objects viewed rapidly in succession.
Phi Phenomenon
An optical illusion of perceiving continuous motion between separate objects viewed in rapid succession.
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