free variable

Daddytypes discusses “kid-sized” tetramino blocks. That’s a pretty cool toy. I suspect that the ones linked to are rather pricey (since the company is based in the UK and no price or ordering information is available from the site), but I imagine that a couple of weekends with the miter saw could produce an acceptable facsimile. (I hope to have at least one weekend free before WT is big enough to play with such a toy.)