The Denver Museum of Nature & Science is growing like a weed, most recently with an elegant if enormous klipp architects-designed addition. With it came the lyrical "Iridescent Cloud," by Seattle's Laura Haddad and Tom Drugan. The piece, constructed by Demiurge Design, is a canopy of sorts, supported by three canted pillars that hold a woven mesh of stainless-steel cable that's been adorned with transparent tetrahedral prisms made of acrylic. As the sun passes over — or when artificial light hits them at night — the prisms sparkle with iridescent reflections.