The length of the stalled choir varied of course with the number of monks or canons serving the church. In a church of the first rank, such as Lincoln or Chester, about sixty stalls seems as a rule to have been found sufficient. These would generally occupy three bays; where more than three bays are occupied with stalls, it is usually because more stalls have been added at some later period, as at Lincoln, Norwich, and Henry the Seventh's chapel, Westminster. In the centre, between the stalls, a considerable space had to be left free, in order to leave room for processions from the High Altar to the lectern and to the ecclesiastics in their stalls; as well as for processions of the whole ecclesiastical establishment on Palm Sunday, Corpus Christi day, Easter Sunday and other festivals, and on every Sunday in the year. The lectern also was often of great size, and a gangway had to be left on either side of it. In Lincoln Minster the space from one chorister's desk to the chorister's desk opposite is 18 feet: from the back of the northern to the back of the southern stalls is 40½ feet, which is above the average breadth of an English cathedral or monastic choir. The breadth of the choir conditioned the whole of the planning of the church; for as a rule the nave and transepts were naturally given the same breadth as the choir, in order that the central tower should be square. As for the number of rows of stalls on either side of the choir, it was usually three, rising successively in height; at Lincoln the floor of the uppermost row is 2 feet 6 inches above that of the choir; the canopies rise 22 feet above the floor. At Lincoln modern additions have been made; at present the upper row consists of 62 canopied stalls; 12 of them being "return" stalls facing east; 25 facing north and 25 facing south. Below them is a row of stalls without canopies; of these lower stalls there were originally 46; in front of these again are the seats of the "children of the choir."