The theory of perspective demonstrated, in a method entirely new : by which the several planes, lines, and points used in this art are shewn by moveable schemes in the true positions in which they are to be considered : invented, and now published for the use of the Royal Academy at Woolwich
John Lodge Cowley's 1766 London treatise on perspective, printed for the Royal Academy at Woolwich, presents its theory through moveable paper schemes showing planes, lines and points in their true positions. The plates are engraved geometric diagrams of overlapping rectangles, with construction lines radiating to vanishing points, and the set can suggest how a designer might lay out a spatial grid or flat pattern.
