The Metropolitan Museum of Art and the Guggenheim offer 474 free art books online. 99 art catalogs from the Guggenheim. 375 MetPublications. An example: Masterpieces of Painting in the Metropolitan Museum of Art [more inside]
Want to see Trajan's Column, Michelangelo’s David (with or without fig leaf), and Notre Dame all in one room? (Well, two rooms.) The Victoria and Albert’s “Cast Courts” are an amazing example of Victorian plaster casting, allowing those who couldn't afford the Grand Tour a chance to see great works of art and architecture.
Netsuke of the Meiji Period is an online exhibit from the Los Angeles County Museum, noted for the depth of its collection. (more). The György Ráth Museum and the Ferenc Hopp Museum also house a fine classic collection. (more). Today, netsuke carving is alive and well - see the Kiho Collection for one young master. If you would like to explore more sculpture for the hand, the International Netsuke Society has a good link list to many excellent contemporary netsuke artists.
Daniel Rozin makes mirrors. But not the boring ones we're used to -- he prefers to make his out of wood, trash and occassionally, shiny balls. His works are a combination of artistic expression and computer vision, and have been on display around the world. Check out the quicktime videos of his mirrors in action and prepare your mind to be boggled. [via cool/lame]