I can look on (a tree) as a picture: stiff column in a shock of light, or splash of green shot with the delicate blue and silver of the background.
I can perceive it as movement: flowing veins on clinging, pressing pith, suck of the roots, breathing of the leaves, ceaseless commerce with earth and air - and the obscure growth itself.
I can classify it in a species and study it as a type in its structure and mode of life.
I can subdue its actual presence and form so sternly that I recognize it only as an expression of law...
I can dissipate it and perpetuate it in number...
In all this the tree remains my object, occupies space and time, and has its nature and constitution.
It can, however, also come about, if I have both will and grace, that in considering the tree I become bound up in relation to it. The tree is no longer It. I have been seized by the power of exclusiveness.
Martin Buber (1958) "I and Thou", pp. 19-20)