Sphericons

Concept by Colin J. Roberts and Paul J. Roberts. Please see their website for more information and history: http://www.pjroberts.com/sphericon/index.php

Some have two positions. In the picture see the amusing paths that these objects (the ones without "Stop" in the filename) will roll along.

3D Modeled by Chris K. Palmer

Printed by Jeff Rutzky. See his model in action here: http://www.vimeo.com/16985828

I uploaded these with Paul's permission to commemorate the arrival of my Cupcake