If we take this map of Milan of the sixteenth century (whose shape is similar to a decagon) and imagine to identify some couples of sides of this decagon as in the figure, we get a bitorus. Exhibit of matemilano (in the section "Topology"), realized by Michele Ciribifera and Stefano Bonacci.
© Stefano Bonacci
foto di Stefano Bonacci e Michele Ciribifera
The image belongs to the sections...:
From the exhibition matemilano (Topology)
The double torus (Topology)
Objects (From the exhibitions of matematita)
Topology (From the exhibitions of matematita)