have numbered this die so that opposing resultant faces add up to 25, as per convention.

A die based on the Hexakis Tetrahedron shape (a.k.a. hextetrahedron). It can be thought of as a tetrahedron in which each of the four sides has been puffed out into 6 scalene triangles. I was reading through Alea Kybos' dice site and he mentions that he has never seen a die in this shape . Right then, I knew it was time for me to make it.Although the shape is isohedral (and therefore fair for use as dice), it has no parallel sides. Because of this, a face doesn't land with a face directly up, as with most dice. But there is a resultant face which is "higher" than the others.I have printed this and it looks beautiful (better than my photography skills can portray). The shape is unique and playful. But like the regular tetrahedon (d4), a point sticks up so don't step on it!I have tested it, and I and others are able to determine the result, so unless you are playing a game with an argumentative person, it should be usable as a d24. IThis model has recently been updated to version 2 with numbers which are less deeply engraved (they were found to be too deep on the first model, which is what is shown in the photograph).