Circle, Mean, Center

While the mathematical image of Aristotle's concept of Contemplative Virtue is the Circle, the Mean is that of his concept of Practical Virtue.  Now, the two seem heterogeneous, from which, therefore, no relation between them is immediately inferrable.  However, a Mean is a mid-point, and a Circle has a mid-point--its Center.  Thus expressed is a common underlying principle that can be called Centricity. Furthermore, not only is his priority of Theory over Practice not obviously derivable from the principle, that the Centricity of the Mean is explicitly given, while that of a Circle is only implied, suggests that the inverse is inherently the case, whether or not he recognizes it.