In the early work of John Singer Sargent (1856-1925), Henry James saw "the slightly 'uncanny' spectacle of a talent which on the threshold of its career has nothing more to learn." Sargent's talent, nay, genius was indeed uncanny, sustained with equal intensity through his famed society portraits, like the scandalous Madame X; his full-size showpieces, like The Daughters of Edward Darley Boit; his thousands of watercolors executed en plein air...