On the other hand, there are those who, like Italo Calvino's “Baron rampant”, born in Cosimo Piovasco di Rondò, become a perennial 'inhabitant of trees' at the age of twelve due to rebellion. And those who escape or the desire to escape in a suspended hut still embrace the choice of keeping roots firmly on the mainland.

In any case, the metaphor of the tree, as the possibility of seeing reality from a different perspective, remains a dream of children and adults. Because its branches and its branches move with the wind, divide loads and balances, host nests and squirrels, live and suggest similarities of architecture with the natural environment that certainly enjoys greater health than us these days.

So, even if “A city is (not) a tree” as Cino Zucchi reminds us, we are not surprised by the numerous experiments on the subject, which offer new and unusual domestic expressions. Of the fact that "every tree is able to support a dream, in a place out of time", for example, Iacopo Gozzi has been convinced for some time who, with the TreeTopBuilder team (another architect + two treeclimbers + a carpenter), has built an elevated house, suspended between earth and sky, right in Grezzana (Verona) where he lives. “It is possible to build it: just follow the safety regulations, carefully study the territory and choose the right tree”, he explains. “It can become a bespoke, custom-made whole, in relation to the client's personality, in terms of tastes, interests and budget of course”.

In Italy there is still no legislation in this regard but in 2018 the process that led to the implementing decree to regulate the parameters relating to the construction of tree houses in the territory of the autonomous province of Trento was concluded. Sharon Davis Design with her Garrison Treehouse, near New York, has instead built, in the park belonging to an old farmhouse in the hills, a generous suspended play area, which becomes habitable thanks to a dynamic system of climbing nets. hatches and slide ladders. Materials used: steel (for the structure and the staircase), cedar (for the external cladding), polycarbonate (for the internal ones). In the higher 'nest', the study with the mahogany desk and the best views of the greenery.

If the imaginary is our projection on the things that surround us, then how can we forget the poetic Bird-apartment, designed by the Nendo design studio which contemplates a small 'block' of apartments built at the Ando Momofuku Center in the forest of Komoro City in Giapponde: on the top of a tree, one person and 78 birds can coexist peacefully.