1. FRS 123: Technology in Art and Cultural Heritage Devices for Linear Perspective

2. Zahn’s Camera Obscura (1685) Zahn’s portable camera: built-in lens, screenZahn’s portable camera: built-in lens, screen

3. Dürer’s devices (early 1500s) Draftsman’s netDraftsman’s net Artist’s glassArtist’s glass

4. Dürer’s devices (early 1500s) Point plotting devicePoint plotting device

5. Cigoli’s Perspective Machine (1610) Moving pen moves bead in viewing frameMoving pen moves bead in viewing frame Two-handed interface (first etch-a-sketch?)Two-handed interface (first etch-a-sketch?)

6. Superposition Devices – 1806: Wollaston’s camera lucida – 1811: Varley’s graphic telescope – Simultaneously see image of real world, paper

7. Online Perspective Applet http://graphics.stanford.edu/courses/cs99d- 98/perspective/assistant.html