One of the carved vertical concave grooves used to decorate a column shaft or pilaster. Description: Flutes are used in all the orders except for the Tuscan. In the Doric column the shaft is usually built up of several separate drums, to which fluting (the act of carving the flutes) was applied after the columns were erected. The usual number in the Doric order is twenty, and they are separated by a sharp edge or arris.The flutes are sometimes filled with a round, convex moulding or bead. This does not, generally, extend higher than one-third the height of the shaft. In the Ionic order the number of flutes is twenty-four; they are relatively deep, and elliptical in section. In the Ionic order these flutes are separated by a narrow flat band called a fillet. In the earlier years the number was not fixed, and as many as thirty-two channels appear; later twenty-four was canonical.