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{{#invoke:Hatnote|hatnote}}

An example of the different definitions of shape. The two triangles on the left are congruent, while the third is similar to them. The last triangle is neither similar nor congruent to any of the others, but it is homeomorphic.

A shape is the form of an object or its external boundary, outline, or external surface, as opposed to other properties such as color, texture, or material composition.

Psychologists have theorized that humans mentally break down images into simple geometric shapes called geons.<ref>Marr, D., & Nishihara, H. (1978). Representation and recognition of the spatial organization of three-dimensional shapes. Proceedings of the Royal Society of London , 200, 269-294.</ref> Examples of geons include cones and spheres.


Shape sections
Intro   Classification of simple shapes   Shape in geometry   Shape analysis   Similarity classes   See also    References    External links   

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