What do you suppose this is?

Walking to the park I noticed this cleverly designed & painstakingly executed item. It took me a few minutes to figure out what it was. At first I thought that I was looking at an elaborate wooden drainpipe, keeping the balcony from flooding on drippy Vancouver days, watering the ferns uncurling at the bottom. Then I realized that I was looking at a catwalk. Now I don't mean the kind of a catwalk that sickly women are paid big bucks to slouch & swing down in an attempt to sell clothing by looking as bored as only possible. No, I am referring to the path that the happy feline that lives up there uses in the middle of a sunny afternoon to exit the house for purposes of a piss & prowl, or perhaps to discover a bird's nest that needs haunting or a tied-up dog that needs taunting. Lucky Kitsilano cat.