Urban living means density, and for city back yards that means fencing: we need clean lines of agreement on where my property ends and yours begins.
But so many existing fences in the city are ugly, common, built on the cheap, installed by rote with no insight, like mere place-holders. We swoon at the magnitude of lost opportunities. If well designed, the fence can strive for art even as it performs its necessary, divisive duties. The key to the sublime lies in transparency to sunlight.