I discovered the website showcasing the works of Dutch sculptor, Rinus Roelofs, thanks to the link in Prof. Hart's Burning Man trip report. He has a variety of unique topological creations, including one titled "Double M�bius", that got me thinking along the lines that led to this construction. If you like my desktop images, you'll love his works which include tessellations, geometric animations and public sculpture installations. Follow the link on my home page to check it out.