Mark Kizelshteyn says:
I've been a hobby maker for a few years, and I recently worked at a FabLab where I learned the "tools," my favorite being the CNC machine. I began experimenting with a chocolate maker friend and we started making all kinds of funky chocolate molds. After lots of experimentation, we decided to share one of our bars: a space invader chocolate bar!
See how the are made here.
Mark Frauenfelder is the founder of Boing Boing and the editor-in-chief of MAKE and Cool Tools. Twitter: @frauenfelder. His new book is Maker Dad: Lunch Box Guitars, Antigravity Jars, and 22 Other Incredibly Cool Father-Daughter DIY Projects