I don't see obvious divisions, but there are events that occur that demarcate certain eras. While looking at a place event-minus-one-day versus event-plus-one-day doesn't look much different there is that division anyway.
Humans like to classify and categorize. We like to make order. The concept of free-flow time doesn't really mesh with our need for order so we demarcate it. We call people born within certain years baby boomers, or x'ers, or y'ers and we shove things into decades.
I'm sure we'll continue to demarcate things and I think we'll see more splitting of the timeline into bits and pieces then we've seen in the past.
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