Yeesh · Life — One Door
Two surfaces with no honest inside: the Möbius strip (one side, one edge) and the Klein bottle (a bounded whole where within and without are the same side, reached the long way around) — rendered in real-time 3D with a torus alongside for contrast. The gold and blue faces flow into one another on the one-sided surfaces and never meet on the torus. Send the traveler one lap and watch its arrow come home flipped.
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