Fresh off the hoopla they've received for their airy park downtown, architects Diller Scofidio and Renfro are moving full steam ahead with their continuing transformation of Lincoln Center. The most dramatic change: the current installation of twin canopies along Columbus Avenue, two mega-straps of steel extending out from the old New York State Theater and Avery Fisher Hall and across the rebuilt and re-christened Promenade. To support these hefty beams, two humongous columns, one for each canopy, have been erected over the newly-sunken driveway that parallels Columbus and is to be topped by "an electronic grand stair 180' wide." The original plan from DS+R shows the canopies supported by large canted panels of glass rather than the less transparent steel seen now, so maybe the scheme has changed. Or could these uprights be temporary and simply part of what is needed to make this aerodymanic addition work?