Millions of 3×5 index cards stacked into shapes like termite-mounds and Styrofoam cups clustered on the ceiling to form a giant cloud are among Tara Donovan’s most memorable past installations, serving to make her the master of the accumulated-object-turned-artwork. For her current show on the 7th floor of Pace Gallery’s Chelsea headquarters, Donovan turns mountains of CD-ROM disks into elegant towers that echo the skyscrapers of Hudson Yards out the window. Attractive and – as always – begging the question of how the artist and her team had the patience to construct such labor-intensive structures, the new work’s recycled sensibility turns trash into treasure. (On view through Aug 16th).