Once upon a time, Arizona was under water. These days, artist Danielle Wood uses ceramic sculptures to remind us of that fact. Calling to mind the interchangeability of cactus and underwater flora, she has created Desert Playa as part of the recent IN FLUX cycle of temporary, site-specific art installations across the Valley. Presented at The Arts at Marshall Square, Wood's work assembles a fired and glazed coral colony in a muted palette of off-white and gray. At night, the sculptures are all the more striking. Lit from within, they look downright otherworldly, the utterly still shapes harking back to an age long past.