Stories tagged "mathematics": 1 All Tags Sitewide Search Story Search Umbilic Torus NC, 2006 By The ExploreCU team Umbilic Torus NC weighs 100 lbs. and spans 27" x 27" x 9" (enveloping torus). It was completed in 1987. Not much is known about this piece. If you have any information, please contact the ExploreCU team!