200808 - pmg
Copyright 2008 S.Monnier
|This image is part of a series of 17 images, displaying patterns with the symmetries of the 17 wallpaper groups.
This is the group pmg, which contains reflection axes (here vertically) and perpendicular glide reflection axes (here horizontally). On the glide axes, half-way between reflection axes, there are order two rotation centers. (The symmetry is slightly broken by the circular central part of the image...)