If the earth were flat one could equally well say that the apple fell on Newton's head beacuse of gravity or that Newton's head hit the apple because he and the surface of the earth were accelerating upward.

Summary

This quote highlights the concept of perspective and interpretation of events. It suggests that depending on one's perspective or belief system, different explanations can be given for the same occurrence. In this hypothetical scenario of a flat earth, the quote proposes two distinct explanations for why an apple fell on Newton's head – gravity or the upward acceleration of Newton and the earth's surface. It emphasizes the importance of considering different viewpoints and the subjective nature of interpretation in understanding causal relationships.