Has any choreographer extracted as much value from the chug step as Mark Morris? Jerome Robbins came close in “Glass Pieces,” and George Balanchine gave chugs some big moments in “Apollo,” but Morris consistently uses the simple move to demonstrate a profound musicality. Chugs are inherently galumphing, but Morris wields them like a baroque architect. It’s as if he paints cathedrals with thick toddler crayons. Though it must be said, he pulls off the same trick with basic walking, running, skipping, etc. During week two of the Mark Morris Dance Group’s run at the Joyce (their first stint ever at the theater: how is that possible?), his ability to erect the sacred from the mundane was on wondrous display.