1. Castor, Northamptonshire, from the South-West. A Norman Church with alterations and additions of each succeeding style.details

Early Norman [church] towers sometimes recieved an additional stage within a brief space. Castor (Fig. 1) is a magnificent example of this, and here the upper stage was certainly not contemplated when the tower was first built. In any case, tower-building was slow work; the upper stages are often much later in style than the lower. Indeed, some Norman towers offer in their successive stages a complete epitome of the development of style during the period. (p.42)