Dear Arachnids, I am very proud to belong to a community that was such an early adopter of the internet. I don't post very often by I greatly appreciate the ideas and information shared by other members. Please keep it up.
Today I have a question that I am hoping, with your collective wealth of knowledge, you can help me out with. I am studying lace grounds patterns that have symmetry. I have been able to find many examples with mirror reflection in them. Roseground is a good example which can be reflected in four mirrors that meet in the center of a square (see the following picture: https://tesselace.com/symmetry/). What I am looking for is grounds that have rotation symmetry - like a pinwheel. That is grounds that can be turned around in a quarter, third or half of a circle and still look the same. In the link above I have included an example of pinwheel symmetry in a little ground that I discovered using a computer algorithm. I have not been able to find very many examples. I have looked through Ulrike Lohr's Viele "Gute Grunde", Uta Ulriche's "Grunde mit System", Cook and Stott's "Bobbin Lace grounds" and "Moderne Grunde" by the Deutscher Kloppelverband (apologies for the lack of umlauts). So my question to you is, do you know of any grounds with rotation symmetry? Many thanks, Veronika Irvine http://tesselace.com In Victoria BC where the wind has picked up, the sky has clouded over and the temperature has dropped but that is OK because I am stuck inside working anyway. With any luck it will rain and water my garden. - To unsubscribe send email to [email protected] containing the line: unsubscribe lace [email protected]. For help, write to [email protected]. Photo site: http://www.flickr.com/photos/lacemaker/sets/
