Persp

Benn reviewing perspective. One point perspective has a vanishing point in the

center of the cube:

Two-point perspective has one on each of left and right:

Three-point perspective has a left, a right and here a bottom off the drawing:

                                               

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So here is a little brain teaser. What does the relationship between the lengths of the outer and inner square need to be so that one is indeed dealing with a cube. Once you are willing to give up on the question, read the commentary below.

3D graphics sometimes suffer from lost of depth, a topic one finds under

irreversible transformations. Could be that well, it depends on the distance the viewer is

from the artifact.