Bullock was a tireless experimenter and learner, and into his work he incorporated his reading of such influences as Einstein, Bertrand Russell, and Paul Klee – and evolved his own system of dynamic principles and concepts. In the 1960s he was a pioneer in color light abstraction, which proved in part to be ahead of its time in terms of technology to support and reproduce it. He then returned to making black and white photographs, creating images that reflected his deeply philosophical nature. Bullock differentiated “reality” from “existence” and used his work to search for the underlying truth of things. He is considered one of the finest printers in the photography field.