Long walks through New York, Paris and London yield source material for Mary Lum’s complex photo and paint collages, now on view at Yancey Richardson Gallery in Chelsea. Titled 11th Avenue, this piece features slices of urban architecture and facades that dynamically multiply the grid. At center, Lum seamlessly turns a photo of metal piping into a flattened piece of paper that in turn guides our eye up and over a grey wall – all moves that keep our sense of space shifting in an engaging way. (On view through Feb 26th).