Figure 1.  Fog in an old-growth redwood forest, Del Norte Redwoods State Park, near Crescent City, California. 

Note that, within a small area of the forest, one sees redwoods of many different sizes.  Such local variation in tree size is characteristic of old-growth forests throughout the world.  In commercially-managed forests, most trees in a stand are of similar size because they are all the same age.  Photograph by Ted.