Michael Wolf is obsessed with taking pictures of dense urban spaces, whether it's the monolithic residential blocks of his adopted home of Hong Kong ("Architecture of Density"), or the tightly packed commuter trains of Tokyo ("Tokyo Compression").

Originally a photojournalist, he has published more than a dozen art-photography books in the past decade. This spring, he is releasing "Small God, Big City," a book project that homes in on the diminutive Taoist altars that crop up on Hong Kong's streets.

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