I had a very odd experience the other day.
I received a letter from the UK. When I opened it and looked at the piece of paper inside I thought to myself, "My, what an ugly shape and size that piece of paper is."
It was an A4 sheet: something I had previously thought was rather aesthetic.
Constant exposure to US Letter paper has made me grow quite fond of its slightly shorter and fatter aspect. It stacks well, fits easily into my bag, and seems just a little more... I don't know... sturdy.
Which is of course complete nonsense. Any well read person will tell you that the ratio of the sides of a sheet of humble A4 is 1 : √2, meaning that when you fold it in half it retains exactly same aspect ratio (hence A3, A5 etc). Altogether more pleasing to the human eye.
At least I still think US Legal remains much more unpleasant that foolscap.