Light
Spectra
Matter, read by its light. Heated to glowing, every element prints a fixed pattern across the spectrum — bright lines where it emits, dark lines where it absorbs. The same signatures astronomers use to name a distant star.Spectra renders them at true wavelength. Hydrogen's Balmer series on black cotton, the sun's Fraunhofer lines wrapped in ceramic, and a six-element reference chart for the wall.
