I'm quite shocked at the violent force of nostalgia I experienced looking at Project C-90, a huge Russian library of pictures of old cassette tapes. I must have spent weeks of my young life worrying about Metal vs Chrome, and which brand was best (I remember a good batch of That's tapes that Richer Sounds were selling cheap). I also remember hearing tell of a fantastically expensive cassette that either a) Had an aluminium shell or b) Had little reel-to-reel spools that went round when you played the tape (depending on which of my friends I listened to). Anyone remember them? (Thanks to Tommy Walker III for the tip. Why don't you download his mixtape and tape it onto one side of a C90?)
UPDATE: Well, the tape with the little reel-to-reel spools was the Teac Cobalt (top left), which was presumably such a bad design for a cassette that they could only make them 52 minutes long. It's is now so rare and fondly remembered that one single tape recently sold for €75 on German Ebay. Imagine what you might get for the truly bizarre Teac Open Cassette System (top right).