From the rectangle to...
This interactive animation shows the various surfaces that can be obtained from a rectangle by identifying its sides in different ways; from the most simple case of the cylinder to more complicated situations.
The animation is in the CD matemilano.
© matematita
animazione di Gian Marco Todesco
The image belongs to the sections...:
The torus (Topology)
Surfaces obtained from a rectangle (Topology)
Topology (Animations)
Further information:
http://matemilano.mat.unimi.it/