A carpet of Fritz Kühn forms the entrance to the Berlin Public Library. It got its name because the area is formed in nine rows one above the other, of 117 variations of the letter A. Took place the creation of the work in the workshop-studio of the artist from design to execution. The A-variations have been forged out of the panels with special tools, beschmolzen in the forge with brass and copper, blued or partially gilded and glazed at the end