During the archaic period, two of the three fundamental forms of Greek columns were developed: the Doric and the Ionic. The third tier, the Corinthian, was created later and was the most ornate and costly. Each column has its own unique entablature. An order is the combination of a column and an entablature. There are four orders in classical architecture. They are Doric, Ionic, Corinthian, and Attic (used mainly for roof beams). The Doric order is the simplest and most common of the four. It consists of a base, shaft, and capital. The base can be of any size but it usually measures about 1 foot by 1 foot. It provides support to the column and acts as a counterweight when it is being used as a weight itself. The shaft is the main body of the column and usually measures about 2 feet tall. It contains the inside surface of the column wall and is filled with rubble or stone dust that has been packed tightly together. The top of the shaft is flat or may have a slight rise due to the addition of some sort of capstone at the summit. The capital is the upper part of the column and includes the cross-beam known as the frieze. The capital is where all the action takes place! It serves as the point from which a column receives its name. The Doric column is used for important buildings such as temples and theaters. The Ionic order is the next most common in classical Greece.