I've done amazing things with Legos.
But if we want to get real old about it, my mom collects wooden toys, most of which are going to be made in that authentic old style. They're simple mechanical devices, meant to do one thing and one thing only. Frequently, the way they're decorated and the thing that they do have some relation - a paddle with a ball connected by strings on one end, and on the other end, the strings come up through little holes to connect to the beaks of several pigeons, so that when you twirl the ball around, they peck at the ground.
I get a sense from them that, from the right perspective, they could be academically fascinating. Don't get much opportunity to play with them, though.