Caused by ultraviolet radiation, it is an all-too-common phenomenon. As climate changes, can this item be a totem of planetary transformation?
Other Fascinating Facts
In the more-than-human realm, sun overexposure is a concern as well. For instance, during hot and sunny days, Giant Monkey Frog covers itself in a skin secretion to prevent drying out in the sun.
Residence time (How long does the matter/material/artefact stay in an unaltered state in the location/context/system before it decay?)
How does the item affect the environment in which it exists?