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. Examples of geons include cones and spheres.
I find this very useful when it comes to art, in particular sketching a live “Scene”. And it certainly helps with redrawing of objects in Graphic Design. How would you use it in your perspective career?