On a scaffold five meters off the ground, artist Meg Saligman uses her paintbrush to carefully touch up an enormous mural covering an entire wall of a Philadelphia parking lot. "At first, I was afraid of heights, but I'm not anymore. Now I actually love it," Saligman said from her perch where she worked on refurbishing the 500-square-meter (nearly 5,400-square-foot) painting.

Michael Landy's bold re-animation of classical art opens at the National Gallery in London, Boris Chaliapin's iconic portraiture for TIME magazine is aired at the National Portrait Gallery in Washington, and contemporary conceptualist Cildo Meireles is installed at the Renia Sofia in Madrid. Mr. TIME: Portraits by Boris ChaliapinMay 17 - January 5, 2014National Portrait Gallery, Washington, DC, USA

Michael Landy's bold re-animation of classical art opens at the National Gallery in London, Boris Chaliapin's iconic portraiture for TIME magazine is aired at the National Portrait Gallery in Washington, and contemporary conceptualist Cildo Meireles is installed at the Renia Sofia in Madrid. Mr. TIME: Portraits by Boris ChaliapinMay 17 - January 5, 2014National Portrait Gallery, Washington, DC, USA

Amsterdam's Van Gogh Museum is selling a limited number of copies of the Dutch master's sketchbooks for the first time, providing rare insight into his life and the origin of some of his most famous portraits, the museum said on Thursday. Only four of Van Gogh's many sketchbooks survive today, three of which form part of a new "Van Gogh at work" exhibition and contain "perhaps some of his most intimate creations," the museum said on its website. The publication marks the first ever facsimile edition of all four sketchbooks, the museum said.