Dr. Volker Latussek wrote about it:

“When I experimented with the tricube v some time ago to find a suitable box for a certain number of v’s, I stumbled across some surprises. I was thrilled with the new ideas that I hope to publish one day with Pelikan.

I will start with a particularly nice experiment: I wanted to put six broken v’s into the FRITZ-FLOP box, into which six v’s fit without much challenge. When a v is broken in the middle two identical parts are created, which I wanted to put back together in a staggered way. The result should be six parts that look as if the two ends of the Tetra cube L have been cut off. As so often happens, I was unable to solve the task I had set myself. I couldn’t find a move that would convince me and would have given you a headache in the search for it. But when I left out a piece and experimented with only five pieces, THE HORNS OF BOOTH was quickly found.

I found the movement convincing, especially because this puzzle has a feature that I a

The goal of the puzzle is to pack the 5 pieces inside the frame. No piece should protrude out.