Using various textured papers and different shades of white, Katsumi Komagata’s die-cut book A Cloud tells the story of the formation and ever-changing shapes of clouds. You can see more pictures here — the shop also has several other interesting books about paper here.
Thanks for sharing the images of that elegant book–and also the link to the paper arts blog/site. The Once Upon a Fold blogger has a lovely sense of taste and tracks down some wonderful work by other paper artists.