The Initial Circle:

Here we see the initial circular level set in both Kuiper's drawing (left) and the final polyhedral surface (right). Both are convex, which is required for them to form the top sets of tight immersions [More].

[Right] Level 2: Pulling one side across
[Left] Comparison to Kuiper's level sets
[Up] Other pictures

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8/10/94 -- The Geometry Center