Figure 5.

Matched angles and computed distances of vanishing points. A. Mean perspective angles (±1 SD) between the rails matched by the three subjects. The judgments were made for physical rails (Rails), depicted rails (Picture), and for lines on a further blank screen (Lines). The black dots indicate the angles of rails and lines measured on the screen, i.e., the proximal stimulus. B. Distances of the vanishing points computed from the judged angles using the inverse relationship expressed by Equation (3) of the Appendix. The left axes indicate distances for the Rails data, the right axes distances for the Picture and Lines data. The dashed lines indicate the distance of the screen relative to the viewer.