Curvilinear Perspective

Curvilinear perspective allows much greater field of vision than traditional rectilinear perspective. In the image below, we are able to see boxes from all 6 directions, and draw them well beyond the vanishing points, while allowing them to still look like boxes. In rectilinear 3-point perspective, the boxes beyond the vanishing points distort severely.

Roll mouse over image to see rectilinear version (give time for both images to load):