In classical architecture, the term attic refers to a story or low wall above the cornice of a classical façade. This usage originated in the 17th century from the use of Attica style pilasters as adornments on the top story's façade. The decoration of the topmost part of a building was particularly important in ancient Greek architecture and this came to be seen as typifying the Attica style. By the 18th century this meaning had been transferred to the space behind the wall of the highest story (i.e., directly under the roof), producing the modern meaning of the word "attic".