This list recently had a very nice photo of translational symmetry. Here is an example of mirror symmetry: http://epsilon.pair.com/~fcb/dogsymmetry.jpg Frances ===================================================== **** Bernstein + Sons * * Information Systems Consultants **** 5 Brewster Lane, Bellport, NY 11713-2803 * * *** **** * Frances C. Bernstein * *** [log in to unmask] *** * * *** 1-631-286-1339 FAX: 1-631-286-1999 =====================================================