The rotational symmetry axis is about the center of the object, not the bounding box. Positioning within the bounding box is noise.
Adjacent-numbered pages: BP167 BP168 BP169 BP170 BP171  *  BP173 BP174 BP175 BP176 BP177
traditional
Harry E. Foundalis
Left examples have wallpaper symmetry group p3 (a.k.a. 333).
Adjacent-numbered pages: BP801 BP802 BP803 BP804 BP805  *  BP807 BP808 BP809 BP810 BP811
nice, math, bordercontent
wallpaper [smaller | same | bigger]
Aaron David Fairbanks
Adjacent-numbered pages: BP1087 BP1088 BP1089 BP1090 BP1091  *  BP1093 BP1094 BP1095 BP1096 BP1097
nice, anticomputer
William B Holland