well, I guess they are maths... You know that trick where you are asked to make 4 triangles out of 6 matchsticks (and make a pyramid, of course)? Does anyone know of a site with stuff like that? I have tried googling but I think I may be using the wrong terms? And if you put lots of those pyramids together into a 3d shape rather than a chain, what do you call that kind of thing? I know it depends on the number of sides but my brain got lost at 3d octogram, which makes sense in my head but I don't think that is the correct term anyway and anyway, I would end up with 16 or even more sides (not counted yet). I am doing a presentation and need to explain how bits of IT fit in together, rather than be a chain, if that makes sense.