According to a new article published on Jalopnik, 11/2/2017, Syd Mead was also involved in the creation of the puzzle image. It remains unclear, if Mr. Mead merely took sketches from Mr. Loewy and made stylish renderings, or if Loewy started the process and Mr. Mead "improved" the design.
In 2014, Jalopnik claimed the puzzle image was a design by Loewy, rendered by Mead.