Got this from the brill BldBlog, which is loving these slow-exposure pictures of St Petersburg. I agree, they're fab. He says:
Some of the coolest photographs I've seen recently are these long exposure shots of crowds in St. Petersburg, Russia. They were taken by Alexey Titarenko for a project called "City of Shadows."
What I think is so interesting about this is that an otherwise unremarkable technique – the long exposure – has the effect of transforming these assemblies of people into demonic blurs, black masses moving through the city. These look more like scenes from Jacob's Ladder or Silent Hill.