Ancient Greek temple three steps, the "crepidoma". The uppermost level of the "crepidoma" provides the surface on which the columns and walls are placed; it is called stylobate. Placed on the stylobate are the vertical column shafts, tapering towards the top. They are normally made of several separately cut column drums. Depending on the architectural order, a different number of flutings are cut into the column shaft: Doric columns have 18 to 20 flutings, Ionic and Corinthian ones normally have 24. Early Ionic columns had up to 48 flutings. While Doric columns stand directly on the stylobate, Ionic and Corinthian ones possess a
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