A while ago on this site we discussed "the golden mean" which is a concept that states something like: this is a universal dimension, repeated in nature, that we seem to be drawn to and feel comfortable with.

http://www.vashti.net/mceinc/golden.htm

The shape is used close to, and used in things like 8x10 dimensions, credit cards/id cards, magazines, newspapers, you name it.

However TV screens are square, or were, and we have gotten use to that.

Personally, although I shoot with a 6x6 I have almost never printed a square print. Even though it works great for certain things.

Cheryl shoots and prints square almost exclusively, so her input would add to the discussion.

Michael McBlane