The ornamentation of an arch was intended to serve as a constant visual reminder of the triumph and "triumphator". As such, it concentrated on factual imagery rather than allegory. The façade was ornamented with marble columns, and the piers and attics with decorative cornices. Sculpted panels depicted victories and achievements, the deeds of the "triumphator", the captured weapons of the enemy or the triumphal procession itself. The spandrels usually depicted flying Victories, while the attic was often inscribed with a dedicatory inscription naming and praising the "triumphator". The piers and internal passageways were also decorated with reliefs and free-standing sculptures. The vault was ornamented with coffers. Some triumphal arches were surmounted by a statue or a "currus triumphalis", a group of statues depicting the emperor or general in a quadriga. The inscriptions on Roman triumphal arches were works of art in themselves, with very finely cut, sometimes gilded letters. The form of each letter and the spacing between them was carefully designed for maximum clarity and simplicity, without any decorative flourishes, emphasizing the Roman taste for restraint and order. This conception of what later became the art of typography remains of fundamental importance down to the present day.