Squirrel's Window?

Faffing about with some tangles last night, I like doing the organic tangles, there is Pokeroot and Pokeleaf and Wist.  I can't remember what the outside ones are called, don't even remember where I saw them, but that particular tangle is one of my favourites.  I am sure someone will tell me what it's called.  Anyway I seem to have ended up with some sort of window, maybe a squirrel's window, or a gnome's window. They have a nice view of the garden, whoever this window belongs to.