A Klein bottle
This animation shows the Klein bottle (that can be obtained by identifying the opposite sides of a square): three buttons give you the possibility of visualizing the Klein bottle transparent or dark, or the possibility of "cutting" it, as in the figure, in order to visualize its structure.
© matematita
animazione di Gian Marco Todesco
The image belongs to the sections...:
The Klein bottle (Topology)
Topology (Animations)
Further information:
http://www.toonz.com/personal/todesco