An RPG with good ‘form’.
I was going to go with The Wildsea, as it’s an odd shape and is also gorgeous – just fantastic art that really brings the setting to life – but I can’t find my copy of that to take a photograph so I’ll go with Cloud Empress instead. Neat little booklets of rules and stuff, and also very pretty artwork both outside and in. In the version I bought I also got patches. It’s an ‘ecological science fantasy’ RPG, so in some ways a very similar vibe to UVG, but more importantly extremely reminiscent of Nausicaa of the Valley of the Wind.
Other examples of good form: Be Like A Crow, Mothership, and really all of the Free League stuff in that classic box/nice art/special dice/solid rules-set format (see Aliens, Twilight 2000, The One Ring).