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Tree staircase is awesome.

Now,this is a clever feature in which the stair rail begins as a tree trunk.

Hooked on Housesfrom Hooked on Houses

This Bainbridge Island Home Comes With Indoor Treehouse

Indoor Treehouse

Cool tree house. The girl child would looove this and might decide to move into it during the summer. I'd add a few things to make it more accommodating so that she could spend her days and nights in it.