SOCHAUX, France — Peugeot has a whole bunch of them: brilliant (and not so brilliant) ideas that didn't go all the way. Now the French automaker has set up a museum exhibition of its failed prototypes, scale models and designs. The Exposition Interdite, or 'forbidden exhibit,' opened on Friday at the Peugeot Musée de l'Aventure in this eastern French city between Besançon and Mulhouse.'An automaker must constantly work on new projects — its survival depends on it,' said Peugeot in its announcement of the exhibition, but added, 'Often, projects that seem to meet the demand at one moment turn out to be out of sync with the market and are abandoned. Nevertheless, they are the reflection of a time period and a style.'Peugeot projects that were excruciatingly close to production will be displayed, along with those that never made it past the study stage. Among the items will be the 1996 Tulip city car, a 1955 all-terrain Jeep-like vehicle, a late-1970s 504 sport coupe...all the way back to a 1902 quadricycle project that 'didn't line up with the desired evolution of Automobiles Peugeot.' Definitely the most bizarre auto museum item must be the set of dental fillings made out of 'Peuginox,' a kind of stainless steel. The crowns were created by the automaker to show off its metalworking prowess. 'Unique of its kind,' says Peugeot, and who could argue?The exhibit will run through June 28. More information about the Peugeot Adventure museum and its exhibits can be found on the company's Web site.Inside Line says: An enjoyable look at great ideas that didn't make it. — Laura Sky Brown, Correspondent