This is an extreme closeup scan (2400 dpi) of a paint chip retrieved from the ruins of Belmont Art Park by Amy McKenzie earlier this year. The fragment is about 1cm thick, and appears to consist of about 150-200 layers of paint. (For a sense of scale, note the ridges of my fingerprint in the lower right.) This should give you an idea of the staggering number of pieces painted in this spot over the decades.