As he worked, the changes to his precise three-dimensional models were reflected instantly in the engineering and two-dimensional CAD files, the working drawings for the motorcycle's assembly.

FORBES: Easy Designer

Mr Cassagnes came up with the idea for a mechanical toy that creates erasable drawings by twisting two dials in the late 1950s, while working as an electrical technician.

BBC: Etch A Sketch inventor Andre Cassagnes dies at 86

Around the room are models and drawings of many of the some 60 civic sculptures Mr. Garten has made and is working on, each of which take between three and six years to complete and include a 40-foot stainless-steel sculpture tower in Dallas and a 16-foot-tall curvy stainless-steel sculpture in Long Beach.

WSJ: Where Art and Architecture Collide