Hi Frosty,
Well of course Gaudi's the name when it comes to expressionist, nature-inspired architecture and undoubtedly Saarinen (and even Corbusier in Ronchamps) are to be studied; I didn't know about Mark West or fabric-formed concrete- I'll definitely look into it, thanks- but I've been following the recent works of Arata Isozaki and other Japanese architects, and kept an eye (aren't we all) on Zaha Hadid, Foreign Office, Morphosis and the rest of the gang !
