Author here - If I thought people were going to rediscover this old project I might have invested some time in redoing the UI, apologies for the crudeness. I was inspired to make a quick plane-symmetry sketching tool after being inspired for years by islamic pattern art, but much more could be done in this direction, especially with a proper vector tool. I highly recommend "The Symmetries of Things" http://goo.gl/1zzZjz for a mathematically deep, readable and well-illustrated coverage of symmetry. "Islamic Design" http://goo.gl/UCkRSa for a beautiful intro to the amazing designs one can achieve exploiting symmetries.