기어 머신

The back-and-forth motion is so satisfying to watch, and the teeth lock together with a solid click that feels sturdy. It’s a simple, durable piece of hardwood that’s held up to daily play without a scratch.

The kids figured out the teeth connections pretty fast, and it’s sturdy enough to survive daily pushing. I just wish the motion was a bit smoother, since it can catch when they go too quick. Still, it’s doing its job for our simple physics lessons.