The CBS television network's initial logo, used from the 1940s to 1951, consisted of an oval spotlight which shone on the block letters "CBS".[203] The present-day Eye device was conceived by William Golden, based on a Pennsylvania Dutch hex sign and a Shaker drawing; while commonly attributed to Golden, there is speculation that at least some design work on the symbol may have been done by CBS staff designer Georg Olden, one of the first African-Americans to attract some attention in the postwar graphic design field.[204] The Eye device made its broadcast debut on October 20, 1951.