This document discusses the history and development of abstraction in photography. It begins by explaining that abstraction emerged in the early 20th century as artists felt photography could represent reality better than painting. It then discusses influential abstract photographers like Moholy-Nagy and the Bauhaus school. Various techniques that produce abstract effects are covered, including camera angles, lighting, shutter speeds, photograms, and still life arrangements. The work of photographers Aaron Siskind and Ralph Eugene Meatyard is also summarized, focusing on their experimentation with abstraction.