The Crevice

A narrow gap between two weathered rock walls, patched with lichen, going back considerably further than the photograph makes it look.

I could not get far enough inside to show the depth without losing the light entirely, which is the standard problem with photographing anything cave-shaped. You either expose for the opening and the interior goes black, or expose for the interior and the surrounding rock turns to paper.

I chose the black

A dark interior reads as depth. A blown-out exterior reads as a mistake. When the two are in conflict the choice is easy, and the small amount of detail lost inside the crevice costs the photograph nothing — arguably the darkness is doing useful work.

The lichen is the real subject anyway. Those patches are slow beyond any useful comparison, and the walls are covered in them.