A triangle shows the three ideologies as poles, in opposition to each other.
Circles result in overlapping.
Not each perspective would agree that they overlap with the other perspectives or even by how much they overlap. Here each ideology is not merely another point, circle, or dimension. In this example, conservatives and liberals are becoming more like radicals. This diagram can also be redrawn with either conservative or liberal replacing where radical is found in this case. Edited by Peter Reed and David Rothenberg.