At the other end of the scale to the cretinous "tagging", which regularly defaces City walls, we have graffiti of this high standard. While not decrying the artistry & effort involved in creating something like this, presumably with the owner's permission, I still don't like it. It is out of place. Old walls are interesting in their own right. There is something strangely satisfying about observing the effects of time and weathering on apparently inert brick, cement and stone. Old walls have character and lend atmosphere to the streetscape. They are a relief from, and contrast to, brash modernity which would be more the natural home for art like this.