Twee puntkommen, één bol en één hol 1851 - 1930

This is a preliminary design drawing for a lampshade by Dutch designer Theo Colenbrander. The drawing, titled "Twee puntkommen, één bol en één hol," or "Two semi-circles, one sphere and one hollow," dates from between 1851 and 1930. The simple pencil sketch shows two views of a lampshade design, with annotations in Dutch for the different parts and construction details. The design features a curved shape with a decorative scalloped edge. The drawing shows Colenbrander's meticulous attention to detail and his interest in creating functional yet elegant designs.