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A couple of Christmases ago my kids received a huge box of Keva planks. I was puzzled at first: What, they don't interlock at all? There's no way to affix them together? They're just... 200 identical planks of wood? What kind of scam is this?
Before too long, however, my son was showing me what was possible within such constraints. (Answer: A lot more than I had anticipated.) Building with these planks requires a lot of thought, care, patience, and planning, as well as an understanding of some basic physics. And my kids are learning all of these things by playing. It's awesome.
So I decided to do some virtual creation with Keva planks myself. This composition consists of 40 identical rectangular prisms, with the same side ratios as Keva planks (1:3:15).