Figure 12.

In the top row the configuration in three-dimensional pictorial space as determined in the first session of observer AD. (a) A ground plan (horizontal coordinate equals the horizontal position in the picture plane); (b) an elevation (vertical coordinate equals the vertical position in the picture plane). The observed values are the depths, plotted vertically in the plan, and horizontally in the elevation. The points are color coded like those in figure 2; the reader will have little trouble to identify the points in the pictorial scene (as opposed to just the picture surface). The horizontal and vertical lines in these figures show the depth dimension in which the points are located. The bottom row shows the configuration for the first session of observer LDW on the same scale; note the compressed depth range as compared with AD.