Here's what I could reconstruct from notes from two weeks ago me.
Circle is gold because it is the ordinary living bulk of language: people, food, nature, substance, and connective tissue. Warm, plentiful feedstock.
Waves is phosphor green because it is perception, communication, radio, light, dreams, and cognition. Green-screen information.
Star is ultraviolet because it is feelings, babble, anomalous language, magic, and things outside ordinary knowledge. Literally beyond visible violet.
Cross is signal red because it is force, wounds, weapons, competition, and immediate expenditure. Alarm, blood, action.
Square began as concrete gray-amber because it is manufactured structure, paperwork, government, custody, quantities, and containment. Institutional material. It was too close to Circle, so I made it bluer.