Recently observed mesh patterns, formed by bacterial Min proteins, surprisingly obey Plateau’s laws for foams. We call these patterns Turing foams and develop a theory for their dynamics, invoking a non-equilibrium analogue of interfacial tension between protein-enriched and protein-diluted regions. This creates a direct link between microscopic molecular reactions and the macroscopic structure of biological patterns. In our publication we elaborate on how the effective interfacial tension emerges, how it gives rise to Neumann and Plateau laws and compare our theory to the real Min patterns.