7 Bridges Collection

The medieval city of Königsberg in Prussia had seven bridges. It was often asked if one could travel across all the bridges exactly once, finishing the walk where it began. In 1736 Leonhard Euler solved this problem, and thus were born two new fields of mathematics: topology and graph theory. This design features Leonhard Euler walking towards a bridge of Königsberg, with all 7 bridges visible in the historically accurate arrangement.