Interference Loom — Weave coherent light into fringes and beams

Place up to eight coherent emitters and watch their waves interfere. Arrange them in a line and shift their phases to steer a beam — the way the Array points sixty-four dishes without moving one.

Coherent waves add: where crests meet crests the light doubles, where crests meet troughs it vanishes.

The Choir on Ennis was a phased array the size of a world. Reproducing its beam-forming was the Institute’s first proof that the signal was made, not found.