Bethlehem Steel built the structural shape of the twentieth-century American city.

The wide-flange beam that made genuinely tall buildings practical was rolled here. So was a great deal of the steel that went into bridges, warships and the skylines people photograph from helicopters. At its peak the company employed tens of thousands of people in this valley and was among the largest industrial operations on earth.

It stopped in the 1990s. What is unusual is not that a steelworks closed, but that this one was largely left standing rather than being demolished, so the buildings are still here in a town that grew up entirely around them.

Black and white is not a nostalgic choice for a subject like this. It is the practical one. The brick is a fairly uniform dull red, the sky behind it is doing most of the work, and in colour the two compete without either winning. Convert it and the subject becomes what it should be: the repetition of the window openings, the line of the roof, and the length of a building designed with no concern whatsoever for how it looked.