[emeltzer]

Err, if you can issue me a pardon here, that was meant to be a footnote but I got the markdown wrong. The footnote should read: "By conventionally folded I mean folded first horizontally and then vertically such that each folded unit is rectangular."

[redthrowaway]

Not to worry; if you were the first to do it I wouldn't be upset. It's a staple of websites and textbooks that drives me mad.