The Uneven Density of History

While reading The Cambridge History of China, I had a simple thought:

history is not evenly distributed across time.

Time itself is uniform, but historical significance clearly is not. Some decades pass through gradual change, while a few years can suddenly contain wars, political crises, institutional shifts, and social transformation all at once.

It feels as if history has its own density.

And perhaps the densest periods are not sudden at all. They are simply the moments when changes that have been accumulating for decades finally become visible.

Physical time moves evenly.

Historical time does not.