After exhausting my exploration of the GreenCode Burr family of puzzles, I wanted to try coming up with a design that had similar piece motion, yet no dead end paths. This puzzle was the end result of that and it has rather pleasing effect of "solving itself" to some degree as you fidget with the pieces. What I mean by this is that simply pushing/pulling the appropriate piece at the appropriate time will somewhat automatically cause the coordinate motion expansion and contraction cycle.