The Green Window

Pipe sunlight down a plastic fibre and green survives the trip best — about 90 dB/km against 155 for red. Shade mosses photosynthesise on green specifically, beyond their respiratory demands, on green alone. The wavelength the fibre keeps is the one the moss can use, and it is the one most plants throw away. A real convergence, and an honest account of what actually binds the idea: not photons, but water and cost.