Gelfand Partners Architects worked with a local rug maker to create vertical felt panels for the ceiling to mitigate sound which then allowed the thermal mass of the concrete slab above to temper the open office areas. (Photo by Rien van Rijthoven) Gelfand Partners Architects worked with a local rug maker to create vertical felt panels for the ceiling to mitigate sound which then allowed the thermal mass of the concrete slab above to temper the open office areas. (Photo by Rien van Rijthoven)