May 5, 2011 by Rogan Tinsley Leave a comment A sliceform crosscap. Minutes to make, hours of fun. From the YouTube caption: This is a Sliceform model of a Crosscap surface which is way of modelling the real projective plane. It’s a one sided surface which intersects itself. (Source: http://www.youtube.com/) Share this:TwitterFacebookEmailLike this:Like Loading... Related Author: Rogan Tinsley Biology, science and maths teacher with a PhD in Neuroscience and passion for education.