Definition:
The art of creating an effect of depth and distance in a picture by representing people and things that are far away as being smaller than those that are nearer the front
example
The artist plays with perspective to confuse the eye.
We learned how to draw buildings in perspective.
The tree on the left is out of perspective.
Oxford English Dictionary
Curvilinear perspective
By superimposing two perpendicular, curved sets of two-point perspective lines, a four-or-above-point curvilinear perspective can be achieved. This perspective can be used with a central horizon line of any orientation, and can depict both a worm's-eye and bird's-eye view at the same time.
