Although less complex and romantic than Hawkins' 'Stone Age calculator' such a technique is certainly feasible if only in theory. Much more elaborate predictive practices have also been suggested for the holes although all these methods, including Hoyle's, require a high level of astronomical awareness and a grasp of some very abstract concepts including knowing where and when to first position the stones around the circle. It has also been pointed out by R. Colton and R. L. Martin that simpler methods exist, based on observing the position of each moonrise, which would have worked just as well and which would not require moving numerous markers amongst 56 holes. This diminishes the astronomical significance of the number of the Aubrey Holes and their circular arrangement and tends to suggest that any astronomical purpose for the site may have been no more than symbolic.