1. Physics: The distribution of energy emitted by a radiant source, as by an incandescent body, arranged in order of wavelengths.
2. A graphic or photographic representation of such a distribution. The visible spectrum is the portion of the optical spectrum that is visible to the human eye.
Hazy Visible Spectrum, St-Janvier, Quebec, Canada.
"What makes photography a strange invention-- with unforeseeable consequences-- is that its primary raw materials are light and time."
- John Berger