It's a set of six dice - each one has a theme; the themes are:
Rolling the dice generates one of 46,656 different unique combinations - which the inventor can then use as inspiration for a brainstorming session.
Some of the combinations are nonsensical, but this itself can be provocative - and the ideas that flow from your imagination in this process don't necessarily have to fit all or any of the original criteria - it's just meant to spark the imagination.
Step 1: Making The Dice
I planed the piece until it was square (about 2cm) in section (as the piece was originally a thick dowel, there was a slight rounded chamfer on each edge, but this didn't matter, as I would be sanding chamfers on all edges of the dice anyway).
I clamped a stop to my mitre jig and cut six cubes (tip: cut a slice off the end first to make sure it's cut square - then lay this slice down and use it to accurately position the clamped stop - that way, you'll cut perfect cubes)
I sanded each face of each cube, then sanded a small chamfer on each edge - this makes the dice more comfortable to use - and helps them to roll a little more. It's a lot of sanding - 36 faces, 72 edges and 48 corners, but it's worth taking the time to do it properly.
If you can't find suitable timber, or can't be bothered with all that cutting and sanding, it's possible to buy blank dice or wooden cubes from craft stores.