Expressionist, Art Deco, International Style… this is the Early Modern Era. the architecture began with a number of building styles with similar characteristics, primarily the simplification of form and the elimination of ornament, which first arose around 1900.
A diluted mould that offers clean lines but still offers a dado solution.
The style stems from a compressed semi circle. The top edge is lined and then steps to a flat front section that then falls away back to the bottom and the wall.