Tucked beneath the trees in the center of MetroTech Commons in Brooklyn is L.A.-based artist Sam Falls’s “Untitled (Maze),” a sprawling architectural plan of a sculpture that invites spectators to step inside its walls. It’s part of his “Light Over Time,” a series of works commissioned by the Public Art Fund. Falls, known for boundary-pushing paintings that incorporate sunlight, rain, and other elements into their production process, has built some of those same climatological concerns into this new public work. The sides of each aluminum panel are painted differently, with one surface lacking a protective UV finish; this means that, over the sculpture’s lifespan, the way the light hits the piece will cause it to change and break down in subtle ways. (Just don’t hold your breath — a good five years of light exposure are needed before the process begins, Falls said.)