*** Problems on the use of perspective in art *** 1. How many vanishing points can there be in a perspective drawing? 2. Does a pair of lines parallel to the picture plane converge? 3. How to avoid distortion of objects in wide-angle perspectives? o Leonardo's paradox - in wide-angle linear perspective views, objects near the edges of the canvas look distorted. Switching to a curved (cylindrical or spherical) perspective fixes this, but straight lines now appear curved. -> Dubery and Willats, row of columns o linear perspective, p. 84 o curvilinear perspective, p. 85