Then the team took the opposite tack. The result is Say No Mo, a gender-neutral space of roughly 2,100 square feet on two floors of a 19th-century building. The project not only breaks from the idea of a salon that is either “his” or “hers” but it also holds up its own version of beauty, uniting the cragginess of a cavern and the molten magic of liquid gold. For the rough part of the equation, cast-in-place concrete forms an arch on the main level that looks like an opening blasted through rock. The reception counter, also cast concrete, resembles a stone block but is fully rigged with plug-in connections. Smoothing some of the edges are golden panels made of sheets of polished stainless steel coated with titanium nitride, a hard ceramic. Two Soviet-era baby bathtubs, welded together, comprise a freestanding washbasin. Painted gold, it, too, gleams.