No, no, no, not my head on a spear like in some ultra-violent Mel Gibson flick. My head on a sphere, as in "a three-dimensional surface, all points of which are equidistant from a fixed point."
It's 3D! It's animated! It's a shameless promotion for my book Windows 3D: Three-Dimensional Graphics Programming for the Microsoft Windows Presentation Foundation!
Many thanks to Deirdre for photo patching and manipulation.