  Correlations related to related to quantum entanglement have convinced many
physicists that there must be some at-a-distance connection between separated
events, at the quantum level. In the late 1940s, however, O. Costa de
Beauregard proposed that such correlations can be explained without action at a
distance, so long as the influence takes a zigzag path, via the intersecting
past lightcones of the events in question. Costa de Beauregard's proposal is
related to what has come to be called the retrocausal loophole in Bell's
Theorem, but -- like that loophole -- it receives little attention, and remains
poorly understood. Here we propose a new way to explain and motivate the idea.
We exploit some simple symmetries to show how Costa de Beauregard's zigzag
needs to work, to explain the correlations at the core of Bell's Theorem. As a
bonus, the explanation shows how entanglement might be a much simpler matter
than the orthodox view assumes -- not a puzzling feature of quantum reality
itself, but an entirely unpuzzling feature of our knowledge of reality, once
zigzags are in play.
