I was kinda surprised when I saw this to see HOW solid through and through he was. It's like tree rings, no? lol! Most of my sculptures have a foam core, but it does get annoying to work with the foam. I remember that when I started this fellow (see June of 2007 here; http://mksculpt.blogspot.com/2007/06/i-cheered-myself-up-with-this.html ) I really started with a scary dog-like skeleton of scratch... just funny to look back at now..