A point is an element that has position, but no extension. It is a single mark in space with a precise, but limited, location. Alone it can provide a powerful relation between negative and positive space, but when grouped with other points the Gestalt grouping principal of closure tends to kick in and the brain compulsively connects the points together. Line or form is a natural result of multiple points in space.
Point
Multiple points in space
Closure
Line
A line is an element characterized by length and direction. Lines create contours and form, and are often used to convey a specific kind of feeling or point to an important feature in a design. Lines are also used to create perspective, and dominant directional lines are often adopted to create a sense of continuance in a composition. In addition, lines that are grouped together often create a sense of value, density or texture.
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