I like the BW with increased contrast, but I'm not sure about the crop, it seems to have lost its "vertigo-ness", I think the two returns of the staircase are needed to make the effect work.For me, this is another one that would be improved by going B&W and a tighter crop. The big hunk of gray concrete isn't really doing anything for me. I'm thinking something like this?
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In the original version I don't like the handrail in the bottom RH corner - certainly a distraction.