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The Art Institute of Chicago just opened an exhibit in the photography gallery in the Modern Wing featuring the work of Robert Frank, who many consider to be the father of street photography, although I think The Americans is a far more cohesive a body of work that goes well beyond the often ad hoc nature of what is typically characterized as street photography.  Throughout the exhibit, there are a number of references to Frank's desire for a quick, dirty, an ephemeral display of his work.