the relationship of the tool to its corresponding finding
Shigo notes that the lightweight chainsaw made possible longitudinal sections, or dissections, of injured trees; he made over 15,000 in a 25 year span.
He found that the discolored wood varies in size, color, and degree of moisture — and shows a relationship to the external wound.
From the longitudinal application of chainsaw to tree, a very particular internal reality of the tree is revealed — albeit violently. Concepts of discolored and decayed wood and heartwood were subsequently developed — but we humans are still knocking from the outside.
(reference: Alex Shigo, A New Tree Biology)
The One Tree Project 