A dusty lens can be a cause for concern, but the flares of sunlight scattering from those particles can make for some rainbow-y lens flare. Paired that with the fallen trees and friendly ferns of Muir Woods National Monument. Instant fairyland!
Ferns always remind me of my childhood and Berkeley seems to have so few. I grabbed this shot at he Berkeley botanical gardens. Looking at this curled up fern up close makes it look like some sort of crazy alien life form.