As someone fairly committed to the death of our solar system and ultimately the entropy of the universe, I think the question of what we should worry about is irrelevant in the end.
Our self illusion is so interwoven with personal memories that when we recall an event, we believe we are retrieving a reliable episode from our history like opening a photograph album and examining a snapshot in time. If we then discover the episode never really happened, then our whole self is called into question. But that's only because we are so committed to the illusion that our self is a reliable story in the first place.
Fourier's theorem has all the simplicity and yet more power than other familiar explanations in science. Stated simply, any complex pattern, whether in time or space, can be described as a series of overlapping sine waves of multiple frequencies and various amplitudes.
