John Baez on Google+ discusses kaleidocycles at https://plus.google.com/u/0/117663015413546257905/posts/Y5nroEHTVvy?cfem=1 And Fred Lunnon seizes the opportunity to wheel out his animation of the seven-link robot / rigid kaleidocycle at https://www.dropbox.com/s/aeo6rxtc5j4p291/sevenring.gif?dl=0 WFL