Turner left hundreds of unfinished paintings to the Tate and thousands of drawings and water colors, so any angle a curator wants to take can be illustrated, and still the torrent of imagination has only been caught in a teacup. (painters-table.com)
The others are the Doni Tondo in Florence's Uffizi Gallery and two unfinished paintings in London's National Gallery, The Manchester Madonna and The Entombment. (dallasartnews.com)