Architecture uses centrality as one of several ordering principles, either by itself or in conjunction with axis to make other, more complex ordering principles. In formal environments, centrality can be created in one of three ways. The first is the creation of a strong centre with a weak edge. The second is a weak centre with a strong edge. The third way to produce centrality is with a centre and edge in balance. In this case, neither of the two elements need to be dominant as they work together to produce the ordering principle. Centrality is a basic gradient where a location that is closer to the centre is considered more influential or important, and a location further away is considered less important. The circle marks an area of influence where things can be at the centre of the circle, within the circle, at the periphery of the circle or outside the circle.