Interlocking - Expanding Box

Expanding Box
Designer:Stewart Coffin
Craftsman:Stewart Coffin
Category:Interlocking
Pieces:6

Stewart considers this more of a coordinate motion toy than a puzzle. All six of the pieces expand outward at the same time. Stewart made 2 in 1971. Number 64 in his numbering system.
 
More information in The Puzzling World of Polyhedral Dissections