Do smoothly curving, spiral-shaped inclusion trails signify porphyroblast rotation? Comment and reply

A comment and reply on smoothly curving, spiral-shaped inclusion trails as evidence for porphyroblast rotation is presented. The comment emphasizes the lack of evidence of the theory that there is porphyroblast rotation and that sense-of-shear using curving inclusion trails may explain the phenomenon. The response contends that the fluid nature of the deformation of rock as presupposed by the comment is not proven. There is no actual evidence of the proposed model of the phenomenon. Rather, actual simulations of rock deformation suggest that there is relative rotation in rocks.