In the script, Aykroyd described the Ghostbusters clothing and vehicle as bearing a No symbol with a ghost trapped in it, again crediting his friend the Viking with the original concept. The final design fell to Gross, who had volunteered to serve as art director. As the logo would be required for props and sets, it needed to be finalized quickly, and Gross worked with Boss Film artist Brent Boates who was also working as a creature design consultant. Boates drew the final concept, and R/GA animated the logo for the film's opening. According to Gross, two versions of the logo exist, with one having "ghostbusters" written across the diagonal part of the sign. Gross did not like how it looked and flipped the diagonal bar to read top left to bottom right instead, but they later removed the wording. According to Gross, this is the correct version of the sign that was used throughout Europe. The bottom left to top right version was used in the United States as that was the design of the No symbol there.