The evolution of knowledge on attic bases, thanks to many studies conducted on early gothic architecture in the second half of the XXth century, can lead to a new synthesis. It hightlights a design free from linear evolution ; this is due to the fact that these bases were favoured by master builders for their aesthetic approach : for each of them, they played an essential part in the definition of the gothic style, relevant to individualised spaces, and to rhyhm (alternating pillars).