Thoughts, ideas, key words.
While things are changing continually, there are things that never change.
People are discussing stuff, how everything was better in the "good old times", people are complaining about this and that, people either fear an apocalyptic scenario or hope that everything will be wonderful soon, and I can't help but think: didn't we have that already? More than once?
And poof! I'm in another century. In another millennium. In split seconds.
Or I travel to the future and wonder: how will the time period we're currently in be referred to in 50, 100, 200, 500, 2000, 5000 years? People tend to believe that they are living in a special time, it was the same in the past and will be the same in the future, most likely.