Natural cycles
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The reason I started thinking about this recently was because I saw an HP(Hewlett Packard) building recently and started to think about the day when the two founders started this new innovative company that pushed technology into our daily lives. Now it is an old slow company that is about as innovative as a rock.
But there is another side of things, our sun which will eventually expand and collapse will eventually compress itself into a brand new sun one day. Even humans; we are born, we live life, and one day we eventually die. Is that sad, well not really since your body eventually gets recycled into the world and becomes parts of plants, animals, and other people.
Culture and media sees this same cycle where a concept is at first new, then old, then obsolete, and then a bunch of dumb kids in 2056 will start wearing nylon shirts and disco dancing to gangsta rap.