Article: Harry Callahan's photographs on display at the National Gallery of Art.(Originated from Knight-Ridder/Tribune News Service)

WASHINGTON _ For more than half a century, photographer Harry Callahan fomented and refined his creative vision through a devotion to innovation and experimentation.

His fascination with the technical and inventive nature of photography helped stimulate a new aesthetic interest in the medium in the years that followed the end of World War II, and ultimately established him as one of the art form's pre-eminent masters.

In tribute to his long and distinguished career, Callahan's photographs are the focus of a retrospective exhibition on view at the National Gallery of Art.

``Harry Callahan'' presents 116 mostly vintage prints produced by Callahan between ...

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