Literature:

The West German Impulse 1900-1914. Art and environmental design in the industrial area. The Folkwang idea of Karl Ernst Osthaus. Exhibition catalogue Karl Ernst Osthaus Museum 25.3.-20.5.1984, Hagen 1984, p. 82f (on the Hagen silversmiths), 148 ff (on Lauweriks and his work in Hagen) A.-Chr. Funk-Jones, Jr ter Molen, G. Storck, Measurement system and spatial art. The work of the architect, teacher and interior designer JLM Lauweriks. Exhibition catalogue, Krefeld 1987, p. 11 (biography), p. 131 (illustration of a centerpiece with design drawing, which still shows a segmentation of the shell) Michael Fehr, Sabine Röder, Gerhard Storck (eds.), Beauty and everyday life. The beginnings of modern design 1900-1914. Exhibition catalogue Kaiser Wilhelm Museum Krefeld, Hagen 1997, fig. p. 144 (chocolate bowl) Röder, Sabine; Storck, Gerhard (ed.): "Beauty and everyday life - German Museum for Art in Trade and Industry", exhibition catalogue Kaiser Wilhelm Museum Krefeld and Karl Ernst Osthaus Museum of the City of Hagen, 1998., fig. p. 144 (chocolate bowl) Martijn F. le Coultre, Wendingen. New York 2001, p. 23 (cf. X-ray picture of a nautilus shell on a page of the Wendingen magazine).

On Lauwerik's measuring system: “Both in the Netherlands and in Germany, Lauweriks was one of the leading artists of the ‘New Style’, who had developed and perfected a method of systematic design based on classical measuring systems. The basis of every design was an exact, reproducible system of lines from which the proportion and form of the object to be designed were derived. Lauweriks and Zwollo paid meticulous attention to precise craftsmanship using the finest materials for the high-quality silver work of the Hagen silversmiths, most of which was executed by the Dutch silversmith Frans Zwollo. Zwollo wrote about the exclusive pieces: “the secrets of the soul can only take shape through craftsmanship”. A colleague of Karl Ernst Osthaus also expressed the same opinion: “good silver work will always have something individualistic about it, will be luxury work in the good sense of the word”. (quoted from: Dr. Birgit Schulte, Karl Ernst Osthaus Museum).