convention
A widely accepted way of doing something in art, shared by artists and viewers.
linear perspective
A system for showing depth in which parallel lines meet at vanishing points on the horizon line.
vanishing point
The point on the horizon line where receding parallel lines meet.
rule of thirds
A compositional guideline that places key elements on lines or intersections dividing the picture into thirds.
hierarchical scale
Showing more important figures larger than less important ones.
atmospheric perspective
Making distant objects paler, bluer and less detailed to show depth.
Cubism
An art movement begun by Picasso and Braque around 1907 that showed objects from several viewpoints at once.