Walking through woods in Oregon we’re bombarded with green all year round. On the ground, we have thick, waxy green salal leaves. Above our heads are the leaves and needles of fir trees, giant oaks, and even towering redwoods near the coast. In the winter, brilliant green mosses and lichens hang from the tree branches like living curtains. Up to this point in the book we’ve primarily focused on inorganic sources of color such as minerals, gems, rocks, etc.