A pattern ××
This drawing is an example of pattern with symmetry of type ××, that use this bird as a module. Here you can see a scheme that displays the symmetry of the drawing.
© Angelo Gavezzotti
disegno di Angelo Gavezzotti
The image belongs to the sections...:
×× (pg) (Symmetry)
The 17 patterns in a series of drawings (Symmetry)
Further information:
http://www.iucr.org/iucr-top/comm/cteach/pamphlets/21/sup/
