Even the particles we do see are thought to be just visible blips of energy fields that permeate the entire universe, like waves cresting above an invisible ocean.
Soon " the world rushed in" : the Cuban missile crisis, the assassination of John F. Kennedy, the birth-control pill, the cresting of the movement for Black civil rights.
A mound-in-motion ran parallel to their rock island—moonlit ripples, sand waves, a cresting burrow almost level with Paul's eyes at a distance of about a kilometer.
Where the Duke pointed, crescent dune tracks spread shadow ripples toward the horizon and, running through them as a level line stretching into the distance, came an elongated mount-in-motion—a cresting of sand.