Cutting a Moebius strip
We can cut a torus along a simple, closed curve and it won't divide in two parts.
See also the interactive animation Cutting a surface.
immagine di Gian Marco Todesco
The image belongs to the sections...:
Fragments of topology (Images from the paths)
The Moebius strip (Topology)
Images from the topology section (From the exhibitions of matematita)
About the project (Images from the paths)