Thanks everyone and thanks for hosting Aristo(it was a tricky one to get to get a good defn. part for as others have already noted), enjoyed the prize...have a great Xmas everyone and hope to see you on good form for the Boxing Day PR.
I've just had time to watch the prize, aristo - thanks. Do you know, it occurred to me to try to work "Falling Water" into my clue, but I thought it might be too obscure!
Hasn't it needed some major repair work on its cantilevers fairly recently?
Yes, chrise. Like so many other pieces of work of 1930s vintage it's experienced sagging. :) I believe they had to prop up the cantilevered balconies here and there with columns, but there's been a major renovation since then. Wright's buildings are prone to structural damage and are notoriously leaky; they're nonetheless (almost invariably) magical.