I saw the Hopps-curated retrospective at the Guggenheim in '97, and have the catalog - a phonebook-sized monster; the reproductions are of mixed quality, but I can only imagine the production issues the designer[s] had to go through, trying to obtain transparencies of decent quality.

The works that stood out the most to me in the retrospective were the 'Cantos' from the Dante's 'Inferno,' [a favorite of mine from Gustave Doré] I think because they are more intimate than his larger scale works while retaining the scope and seriousness. They read more like Darwin's 'Voyage of the Beagle' - direct, immediate field observation, rather than the polished theory.

Another group of pieces that have stayed with me are the flattened cardboard boxes from the early 70's. By stripping out most of the pictorial references you can really see his genius for composition. The beautiful structures that remain are like skeletons of his other work - they have the same appeal that skeletons do - the specifics come and go, but the structures endure.