German photographer Andreas Gefeller's Supervisions series, begun in 2002, is labor-intensive stuff. He collages literally hundreds of small aerial views of public spaces into a large-scale photograph that, by lacking a central focus, challenges our perception and seemingly oscillates between two- and three-dimensionality.

German photographer Andreas Gefeller's Supervisions series, begun in 2002, is labor-intensive stuff. He collages literally hundreds of small aerial views of public spaces into a large-scale photograph that, by lacking a central focus, challenges our perception and seemingly oscillates between two- and three-dimensionality.