IMPORTANT DEFINITIONS ABOUT THE SHAPE

Shape: It is the external appearance of an object or element in a image.

Natural shapes: They are ones related to nature. They haven´t been created by humans or mechanical procedures.

Geometric shapes: Shapes whose parts follow a mathematic order laws pattern. 

Flat shapes: THey have two dimensions such a paper sheet a cinema screen or a canvas

Artificial shapes: Shapes with have been created by humans or mechanical procedures.