In the history of design Dieter Rams – age 86 – is already a deity. His famous Ten Principles of Design are the design world’s Ten Commandments. His precept “Less But Better” is or should be etched on every designer’s forehead. Actually, considering today’s concern for sustainability, they should be etched on every person’s forehead. Rams’s products for the German manufacturer Braun have inspired countless designers, including those of Bang & Olufsen, and of course, Apple. There is, of course, a documentary. And books. One of which, “Less and More: The Design Ethos of Dieter Rams” originally published in 2015 by Gestalten, is now in reprint. The book serves a double duty as a catalog accompanying the eponymous museum exhibit that has been traveling the world since 2009, and is now on view at the Philadelphia Museum of Art.