The A-series and B-series

The A-series and B-series are ways to understand how we perceive time. The A-series views time as a flowing sequence, with events moving from the future, to the present, then becoming past—like a timeline where things change their position over time. The B-series sees time as a fixed order of events that are either before or after each other, like a map where events are anchored in a permanent sequence, regardless of how we perceive them. In simple terms, A-series is about passing time and changing states, while B-series is about the unchanging order of events.