ウォータータイマー | KiwiCo

My kids spent a whole rainy afternoon building the water wheel and testing how fast the cuckoo would pop once we adjusted the water flow—the gravity spout is surprisingly satisfying to watch. It took us about an hour to assemble, but the final spin is so hypnotic I caught myself refilling the cup se

The cuckoo bird actually pops out and moves when the wheel turns, which my kid found hilarious. Setting it up took a bit of patience, but watching the water wheel spin purely by gravity is oddly mesmerizing. It’s a clever little build that explains energy transfer without feeling like a lesson.

The water wheel spins up surprisingly fast once you pour the water in, and watching it drive that little cuckoo bird is genuinely satisfying. My kid and I built it in one afternoon, and the energy transfer is so visible it makes the whole concept click instantly.