Going Down?

To announce the opening of its new thrill ride, a London mall hires an artist to paint an optical illusion in an elevator car, making it look as if its floor had crumbled away (story and video of the reactions): http://www.dailymail.co.uk/news/article-2101412/Alton-Towers-reveals-latest-ride--Nemesis-lift-dont-want-jump-in.html?ITO=1490