Recently discovered in a locker beneath some old gym clothes (a bit random, that), this first edition New York City Transit Authority Graphics Standards Manual is quite, quite superb. Designed by Massimo Vignelli at Unimark International (of lab coat aficionado fame) in 1970, it's barely aged a day – testament to just how influential the great man still is.
Every detail deserves closer scrutiny, so it's well worth visiting the Standards Manual site for shots of the whole thing. Or, for a more concentrated graphic burst, lovely chap Matt Coyne has put together this video flick-through. Get it on the biggest display you can find, prise you're eyes open with matchsticks and stick it on loop for a few hours.