The demonstration of conformal maps with two-dimensional foams

Monodisperse two-dimensional foams are produced by trapping a layer of equal-volume bubbles between two glass surfaces. The application of an appropriately angled or curved surface imposes a specific variation of the bubble area with position in the foam. With this easily demonstrated technique the foam can be created in such a way as to reproduce conformal maps of the hexagonal honeycomb lattice to a good approximation.