Language is a representation.
For instance, programming languages are representations of thoughts and ideas interpreted based on a system of constant rules, and then executed based on another system of constant rules.
All programming languages are messages human leave to both other machines and other humans. All relay actions are meant to communicate an event to form a sequence of events (the sequence of itself which is relayed). All action is representational state transfer (not the Roy Fielding type).
On the contrary, human thought and human relationships are not representational. They are wholly unique and ever changing through infinite circumstances.
Human affairs will always produce more interest to posterity in this respect; than their creations, I mean. Nature in and of itself is fascinating and probably more interesting than one species in nature, but that is a subject for another essay entirely.