no "M" video games at MSI exhibit

Chicago Sun-Times (Andrew Herrmann):

A new video game exhibit from Europe opened Friday at the Museum of Science and Industry. But, for its stop in Illinois, where Gov. Blagojevich has complained about video violence, all of the games rated "M" -- Mature -- have been removed.

Museum official John Beckman said a handful of original exhibits that allowed sampling of M-rated games such as "Grand Theft Auto" and "Doom" were rejected.

What would be analogous "exhibit modification" at an art museum?