Although the bulk texture is stable and therefore shows no rotations on sample scale, the c-axes of individual grains continuously rotate. This can be shown, for example, by the red grain on the right hand side of the white dashed line whose interference colors continuously darkens as a consequence of a counterclockwise rotation of the c-axis.

A similar phenomena is seen in the yellow grain on the left hand side of the white dashed line where formation of several orange subgrains indicate continuous rotation of the c-axis.

In both cases the grains rotate into unfavorable orientations for intracrystalline gliding (become darker) and therefore they become consumed by grain or subgrain boundary migration of more favorably oriented grains or subgrains.

This cyclical behavior  of  rotation and consumption on the grain scale is responsible for the preservation of a stable steady state bulk texture.