. . . adds up to a whole lot – in this case, updated electrical systems for the new American galleries. Square elements shown upper and middle right are sections of Unistrut metal framing. Secured to the ceiling more than 25 feet above the gallery floor, and well above the height of the gallery ceilings themselves, this framework supports vertical hangers that drop down to hold suspended trays for runs of cable or high-power bus duct, a system of enclosed circuitry. The round metal tubes comprise conduit for standard electrical wiring.