The stones in a well built dry laid structure can be described as all 'talking' to each other in a pleasant and satisfying way. Understanding the elements of that ‘conversation' helps one appreciate what’s going on.
You can analyze any wall’s ‘appearance' by letting your eyes listen to the how the stones are interacting and how they are coping. Stones that have been placed structurally have all been put into a logical and meaningful arrangement, and thus are in 'agreement'. The resulting wall is the 'story' that they tell.