Column cylindrical disks of alternating diameter. The shaft is almost never fluted. The proportions vary, but are generally similar to Doric columns. Height to width ratio is about 7:1. The Ionic column is considerably more complex than the Doric or Tuscan. It usually has a base and the shaft is often fluted (it has grooves carved up its length). The capital features a volute, an ornament shaped like a scroll, at the four corners. The height-to-thickness ratio is around 9:1. Due to the more refined proportions and scroll capitals, the Ionic column is sometimes associated with academic buildings. Ionic style columns
Simon Bosboom after the dismissal of Willem de Keyser, and in 1657, the year of Van Campen's death, Bosboom was promoted to city architect. Just as Hubertus Quellinus had done for the city hall in 1665, Bosboom published a small instructional booklet on architecture with engravings after Vincenzo Scamozzi entitled "Cort onderwys van de Vyf Colommen"; or "Short instruction on the five columns (Doric, Ionic, Corinthian, Tuscan, Composite)". His book earned him an honorary place in Cornelis de Bie's book of artists. He wrote that he helped Jacob van Campen and Artus Quellinus with decorations for the City Hall of Amsterdam, built