Watching photos made in Zurich this September, I noticed strange window construction. What does this red wooden box stand for? It's too small to be a balcony - at least for adult human, probably it's done for infants or cats? Another idea - probably it's old-fashioned refrigerator from old times? I have not succeeded trying to find information about it in the Internet.
My guess is that it's for growing flowers and vegetables, simply a small greenhouse. They are sometimes called Greenhouse Windows or Garden Windows.
Because they have windows on 3 sides they'll let in as much sun as possible. They are most effective if put on windows facing south or north.
Being literally on a window you can take the plants indoors during colder nights and days and then put them back out when the sun is shining.
They could double as food storage during longer cooler periods and maybe as ovens during summer.