Solution
We covered a billboard in a magic eye pattern that encouraged people to view the new MINI in 3D. Of course, the pattern didn’t actually work, even leading some people to comment online and call up radio stations asking if anyone could see the 3D car. After a week we secretly put a fibreglass model of the MINI (also covered in the magic eye pattern), creating the illusion that the magic eye pattern worked. Once again people rang radio stations and commented online, this time to say how the pattern worked and that they could see the MINI.