A twenty-sided die is twenty triangles that have to meet at exactly the right angle, twelve times over. This kit’s entire design problem is getting a beginner to that angle without a workshop.

The answer is the two cutters. Foam-smithing normally means freehanding a bevel with a craft knife and accepting that your joins will gap; Lumin’s ships a custom bevel cutter for each hand, so the cut runs the same way regardless of which one you favour, and the edges close. Everything else in the box exists to remove a decision: twenty EVA foam triangles pre-cut, one spare, a pack of blades, and cut-and-stick foam for the 32 edges and 32 corners. The numbers arrive on a cut-and-stick sheet in your choice of four fonts, one of them a proper blackletter. There is no glue anywhere in the kit, which is the line that makes it a Sunday rather than a project.

Three sizes, priced 112, 149 and 239 on the Australian maker’s own storefront, under the names Large, Extra Large and Gargantuan. What the listing does not include is a single dimension for any of them. The size comparison is a photograph of all three on a workbench with a banana in front, an arrow, and the caption “banana for scale” — which is either an oversight or a very confident piece of copywriting, and having seen the picture, it is the second one.

It is a collaboration with Jazza, the Australian art YouTuber, and it came to attention through his attempt at the largest rollable die on the planet — a build using metal tube framing, 3D-printed connectors and hand-painted foam skin. Worth being clear about what carries over: the record attempt is not what is in the box. The kit is the domesticated version, and Lumin’s says so in as many words.

The limitations are the honest ones for foam. It is light, which is what lets a Gargantuan die roll at all, and light means it will not survive being thrown across a room forever; the surface takes primer and paint if you want it to stop looking like foam, and stays foam if you do not. Kits are made to order with up to a week before dispatch, and the age guidance is 14+ — reasonable, given a pack of blades is part of the contents.