For the 50th birthday of GS, the brand will unveil Citroën GS by Tristan Auer for Les Bains. Citroën entrusted a GS to the interior designer Tristan Auer, so he could transform it for display at the Retromobile show. It will then head off to its destination for the next three years, Les Bains (an institution of Parisian nightlife since 1978, which is synonymous with the era of GS).