The boundary of a Moebius strip
The boundary of a Moebius strip is made of a unique circumpherence.
© matematita
immagine di Gian Marco Todesco
The image belongs to the sections...:
From "fragments of topology" (From "XlaTangente")
The Moebius strip (Topology)
Further information:
http://www.toonz.com/personal/todesco