The National Gallery of Art in Washington, D.C. has an intriguing online exhibit about the Pre-Raphaelite Brotherhood, which was formed by three painters, J.E. Millais, W.H. Hunt, and D.G. Rossetti in the 1840s, as a response to the establishment of photography as a popular medium. The Brotherhood and their followers aimed to "return to the purity, sincerity, and clarity of detail found in...