Observation: red and green lights make yellow; green and blue lights make greenish-blue…
Hypothesis: additive mixtures of lights average out the wavelengths to an intermediate colour.
Prediction: red and blue together will produce green.
Experimental: nope – it made purple.
Now, audience participation time – choose your own Conclusion!
- colours add by a mechanism somewhat more involved than their position along the visible spectrum.
- purple must be fake.