Tend to follow the theory that Silbury and Avebury belong to two different traditions. If the Avebury builders wanted to incorporate Silbury into their 'visual' view of the world they could have easliy done so by siting the Avebury circle complex half a mile or so west from its present location. The fact that they chose not to suggests that by the time Avebury was built Silbury was already regarded as irrelevant to the new tradition of circle builders