“Any curator will tell you that it takes time to learn a new building’s personality quirks — to figure out how best to configure temporary walls, take advantage of sight lines that let art pull a visitor through the galleries and calibrate an installation so that objects visually speak to one another. The Broad’s inaugural installation began only in June. That’s quick. Three visits over that relatively brief period revealed a work in evolutionary progress, with many changes along the way. Some may yet come before doors open to a curious public next week.”