Key points are not available for this paper at this time.
1 Descriptive Topology.- 2 Methods and Media.- 3 Pictures in Perspective.- 4 The Impossible Tribar.- 5 Shadows from Higher Dimension.- 6 Sphere Eversions.- 7 Group Pictures.- 8 The Figure Eight Knot.- Postscript.
Weeks et al. (Thu,) studied this question.