Appendix 1
The Science of Colour
Suppose you were in contact with a being from another world via a hyperspace postal link. How would you show your two-headed friend what our world looks like? One way might be to get an extra set of prints from your holiday photographs and beam them over. But would he, she or it see the photos the same way you do? Probably not. Our eyes are tuned to the narrow range of electromagnetic frequencies that are useful for vision and can penetrate the Earth’s atmosphere. What’s more, within the range of visible wavelengths available covering nearly an octave of frequencies, the retina only has sensors for three colours – red, green and blue. From this limited information we form an opinion of what our world is like. ...
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