This should really be Theresa's post. She's the one who mentioned a whole separate blog about things in trees. Apparently, it was quite common in Edinburgh to see the oddest things, a traffic cone for example, up a tree.
This is a sight I encounter on my drive to work.
Just in case you cannot believe your eyes, here's a close-up of the ladder, sideways, in the tree. I hope to catch someone on it at some point so I can ask, "What the hell were you thinking?"