Curvilinear, or five-point perspective, is a drawing method that creates a wide-angle ‘fisheye’ view of a scene on a flat surface.

Five-Point Perspective: This one is known as fish-eye or curvilinear perspective. You can also think of it as what it would look like if you were looking through a door’s peephole. Your vanishing points will again follow the N, W, S, E marks but with the fifth vanishing point being located in the center of your drawing.