Or maybe they're "Addition Blocks." Or something else entirely. I don't even know. This is a little experiment I was trying playing with a little physics and some math. Maybe it becomes a challenge to reach a particular number in the shortest number of steps by combining blocks? Or maybe it can lead to learning how multiples and factors work? I really don't know, but I still think the best way to understand (and enjoy) mathematical concepts is to literally play with them, so here you go: Click and hold blocks to drag them around; see what happens when you knock a "+" into the other ones . . .