The south side of the roof deck features a railing / planter box. Its main purpose - once filled with tall plant material - is to provide a sense of spatial enclosure as some shade (and privacy). Yesterday and today I installed the false "floor" inside the planter, and today I set the initial array of pots with tall grasses.
(click on the images to advance others)
The initial collection of grasses features a former single clump, located in a backyard in Edina. We divided it into four sections and transported them over to our house. Like the trees we transported from the property, time will tell if they survive. It's likely that we'll rotate in other tall grasses such as Karl Forester to give more density and variety.