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Here, Alexander is just putting together some nesting dolls. He puts the tops with the bottoms only. I've tried showing him how to nest them, but he's not interested yet. This is enough of a challenge so far.
Ideally the dolls would be only wooden. I've got about 10 nesting dolls in a personal collection. Some of them are very old. Some are fragile. And though most of them are wooden, they squeak a lot and are hard to assemble/disassemble. So this plastic robot version works well enough for us.