Moss and Lichen: The Slowest Green There Is
A patch that took twenty years to cross a stone, and most people step over it on the way to the view.
Lichen grows at the pace of a fingernail clipping per decade, some crusts a millimetre a year, and the ring you find on a boulder is older than the path you walked in on. Moss is quicker but not by much, and both hold water long after the rest of the ground has dried. They are the only things on the rock keeping their own weather.
Up close the scale falls apart in a useful way. A macro lens turns the surface into a canopy with clearings and shadows and something that looks like undergrowth, and the eye reads it as a forest seen from a low aircraft. Step back one pace and it is a stain, which is the whole trick: the subject does not change, only the distance you agree to.
Photographs of it want soft light, because sun burns out the pale tips and drops the hollows into black. Overcast is not a compromise here but the correct weather. On a screen, a picture like this asks for a long look rather than an immediate one, and it rewards the second glance you give it a week later, when you notice the small red cups you missed.
