I will present a summary of some aspects of a study of triply-periodic minimal surfaces begun in 1966. If present plans are implemented on schedule, I will show a set of 3D-printed specimens of successively larger versions of the ‘Voronoi polyhedral gyroid’, a plane-faced approximation of the gyroid minimal surface with the same symmetry and topology. These objects are a toy model of the nucleation and growth of gyroid-like crystalline domains of the kind revealed by the Teragyroid’ computing project (cf. TeraGyroid - Final report), which employed a Lattice Boltzmann algorithm.