Why do paintings use perspective?
Short answer
Paintings are made on flat surfaces, but perspective can make nearby objects look larger and distant objects look smaller. This creates the impression of depth.
How it works
To our eyes, objects of the same size appear smaller when they are farther away. The way the sides of a road seem to meet in the distance is one example. In linear perspective, these lines are directed toward a vanishing point on the picture.
Size is not the only clue. Overlap, vertical position, and differences in lightness can also help show which objects seem nearer or farther away.
Key point
Perspective is not the only way to make art. Artists may weaken or avoid it to emphasize the flat surface or create a distinctive visual effect.