We've always loved treehouses and imagine that if we ever leave the city it will be for an opportunity to live up in the canopy. When we see other people's arboreal flights of fancy, like these for instance, we study the details, the better to piece together our Ideal Treehouse blueprint. So it occured to us when we spotted this one last week, built for the squirrel citizens of Golden Gate Park, that if we lived in the trees to begin with (as squirrels often do) that our dream house might be located someplace lower. The beach maybe. The windows are a little small, but all in all, a nice little treehouse.