This is a WWII atomic bomb replica named "Little Boy", now in a portable format and MUCH less dangerous. The joke of this series Creatus Maximus is the fact that they are smart bombs (Smart Bombs) so it has a brain!
It suffered a small conversion since the fins were a choice of arms (which also featured robotic arms and bat wings) I carefully drilled the bomb and glued the fins in a new position. I glued it to a plasticard base for stability.
It was painted with acrylics.