Gyroid

A minimal surface that repeats in three directions and divides space into two tangled labyrinths, with no straight lines and no planes of symmetry. Schoen found it at NASA; butterfly wings and some polymers build it at the nanometre scale. This block shows two periods; the level set drifts.

sin x cos y + sin y cos z + sin z cos x = c

On mathcurve.com as Gyroïde