April Fool's or something far more serious? How the design world gets punk'd every single day. David Serero wants you to know, first of all, that it was not a hoax. It was not, as many claim, a publicity stunt. And it was certainly not an April Fool's joke. "We do have this tradition also," the Paris-based architect told me in an email. "But our project was released three weeks before. Isn't that a little early?" For those three weeks, whatever it was unfurled through the design world like giga...