No elegant, continuum explanation for wall formation
			Now, Multitudes of phases: magnets, superconductors, superfluids, dozens of liquid crystals, spin glasses, quantum Hall states, early universe vacuum states… (continuous broken symmetries) •  Rigid to deforming order parameter field •  Continuous deformations: Only crystals, quasicrystals form walls*
				Why?
						*Smectic A focal conics, Meissner effect