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A fake knot
We define a "fake knot" as a knot (so, a simple, closed curve in the space) that can be de...
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A Moebius strip
If we take a long and narrow rectangle and paste together the two shortest sides after hav...
If we take a long and narrow rectangle and paste together the two shortest sides, we get a...
The boundary of a Moebius ...
The boundary of a Moebius strip is made of a unique circumpherence.
A Moebius strip: the colouring puts in evidence the boundary, that is made of one circumph...
Knotted columns (ophitic) in the transept of Trento cathedral (13th century).
A sphere made of alabaster
A torus in alabaster.
from "fragments of topology"
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