Frozen in Flight

Watch an arrow fly. At any single instant, the arrow occupies a space exactly equal to its own length. It is not moving into new space because an instant has no duration.

Zeno of Elea proposed this around 450 BCE, and it took over two thousand years to find a satisfying mathematical response. The paradox is not about arrows — it is about whether time and space are made of indivisible points or continuous flows.