Sara Genn distills the act of painting to its material core, wresting boundless variation from subtle distinctions of color, shape, texture, and touch. How to Build a Sky is the first solo institutional exhibition for the New York- and Palm Springs-based artist, featuring a suite of paintings that respond to SITE’s architectural frame and a mural commissioned for the building’s courtyard. Genn invigorates traditions of geometric abstraction with her own signature technique, mixing custom…