An abandoned mall somewhere in middle America. Evidence of slow decline, hints of violence around the periphery. The dying light from above illuminates the branches and leaves of a once-green tree. There is no wind to cause the leaves to fall, and so it stays, frozen in space as time itself decays to nothing.

Trails left by energetic subnuclear particles as they propagate through a cloud chamber following a collision event. Fragmenting, dividing, coalescing, and eventually fading away, the trails of ionized gas particles they leave in their wake are the only evidence of their existence.

A standing wave in a river: the medium of the wave is in constant translation, but the structure remains constant in space and across time. The complex persistent structure is a product of the energy of the water interacting with the hidden shape of the riverbed beneath and around the wave.