Moebius with three half-turns.
Imagerie C.Tardy.
This object was
used as a logo by the wool laundry brand "Woolmark".
We expected, Christophe and I, to find something
just as readable by rotating a segment perpendicular to
a circle along it, while imposing three half-turns.
But the result is not as nice as for the
one-half-turn version.
Polyhedral version