Julie Mehretu, Black City, 2005Ink and acrylic on canvas108 x 192 in. (274.3 x 487.7 cm)Ovitz Family Collection, Los Angeles.Photo: Erma EstwickCourtesy of the artist and Marian Goodman Gallery, New YorkJulie Mehretu, Black City, 2007Ink and acrylic on canvas108 x 192 in. (274.3 x 487.7 cm)François Pinault Foundation.Photo: Tim ThayerCourtesy of the artist and Marian Goodman Gallery, New York