The open ending of the Citroën story inspired Mœbius to wonder what would happen next. He plotted out three or four books' worth of stories that were also conceived as the basis of a coherent Mœbius universe, one which crossed over with other major works like "The Airtight Garage". In effect, a recurrent character in the series was "Master in French Burg", Stel's dream guide who aided him in his quest on Edena, which was a palindrome of " Grubert", the main protagonist of "The Airtight Garage", and by Mœbius intended to be one and the same person.