When shopping for my first camera (my beloved F2AS), I overheard an individual in the store declare (rather loudly) to a salesperson in the store that ALL photographs were either vertical or horizontal. This same individual subsequently repeated the same comment to yours truly as my purchase was being rung up. Shooting 35mm for several years, the proposition seemed obvious. When I moved up to shooting with the Hasselblad, however, I recalled the comment, thought about it for a moment, and decided to challenge it when I shot 6x6. To this day - some 25 years later - I have yet to crop when printing my medium format work. Part of it, I think, is the challenge of filling the square format; part is just a liking/discipline of the square format/full-frame shooting (i.e. I force myself to exercise greater care when composing); and the greater part, I am quite certain, is a subconscious (?) defiance of that certain loud-mouth in a that camera store so many years ago...