Picture Time as the surface of a pond. Events are a stone being dropped into or skipped along the surface of that pond. The waves produced by the event are vi

Picture Time as the surface of a pond. Events are a stone being dropped into or skipped along the surface of that pond. The waves produced by the event are viewable from all angles. The actual event -the stone drop- occurs only once. The event is immutable, even though the ripples persist and are measurable. We may eventually be able to view the ripples in more detail, and see past or future events. The events themselves though, are immutable. They've already occurred or have not occurred yet. The stone does not change. The interaction between stone and surface does not change. What changes is our ability to decipher data from that event, not the event itself.