A very short, definitely fictional but delightful little tale about Katharina Gsell, Euler's wife. In this fictional account, Katharina is supposed to have displayed a graph of the 7 Konigsberg bridges which were fully traversable by visiting every bridge only once (“An abstracted model of Konigsberg and its seven bridges”). This as an act of revenge for Euler supposedly leaving her for her half-sister (don't know if this is true at all). There is, of course, a bit of sleight of hand in the graph but one which is instructive in wrap-around geometry. Very nicely and compactly written.