Artist Tim Knowles explains that the exploration of Chance and Process is core to his artistic practice. Check his Tree Drawings to see what that means.
Tim writes:
Drawings produced by pens attached to the tips of tree branches, as the branches move in the wind the tree draws on to a panel or drawing board on an easel. Like signatures the trees drawings tell of the tree’s character; a Hawthorn producing a stiff, scratchy & spikey drawing an Oak a more elegant flowing line.
Link via Kottke