Why Does Light Behave Like Particles?

From Richard Feynman's book QED: The Strange Theory of Light and Matter 

But why are the detectors where they are? Here is air behaving like particles:

Unfortunately my computer algebra system isn't well-enough developed  to show you the maths behind this, yet.

See The Action Lab - Ulexite (How Does Television Stone Work?) and Sabine Hossenfelder on The Origin of Life. I was looking for a post where I mentioned Maxwell's earlier work on a vortex picture of electromagnetism but I can't find it. Instead, here's Terence Tao and Richard Feynman and Prof. Shamik Gupta - From Fireflies to Power Grids: The Physics of Spontaneous Synchronization. And there's a madman in Ireland somewhere with a pile of python code and electronic circuits that do synchronised oscillation and he is using path integrals to describe this. It was a bit much for me to take in at the time but he could be onto something.

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