Designed and sold by David Litwin, 2012.
(laser cut plastic and stainless steel screws, 5.5" tip to tip, 3/4" thick)

This puzzle is beautifully custom made from layers of laser cut plastic. It is a successor to the Elemental Neon puzzle, and like that puzzle: Here are photos of each of the three plungers moving (and for each, the plunger can also move in the opposite direction):