Well, I'm bored so I'm posting a picture I took standing in my backyard of my next to next door neighbors' tree. Yes, it's a lousy out of focus or too much light shot but I haven't found time to take another; I'm spreading compost and other stuff right now.
I figured it was a tree house and wondered what parents or grandparents would let their precious babes climb that high; my "right beside me" neighbors assured me it's not a TH and told me why it exists. I would never have guessed. So why do you think they built it?
ETA: The clue is in the very unfocused greenery that I failed to notice even when it was looking me clearly in the eye.