Fig. 5: Phason flips.
From: Aperiodic approximants bridging quasicrystals and modulated structures

a Schematic phason moves in a self-assembled pattern from ABC triblock terpolymer/homopolymer blend. Colored circles and triangles represent the same as in Fig. 4a, b. b Two types of phason flips in the metallic-mean tiling. c Move of a twin boundary by a row of phason flips. The difference is explicitly shown in color.