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In this chapter we explore whether it is possible to see colour beyond the wavelength range we usually consider as ‘visible’. We discover that many animals can see ultraviolet light and consider how this colour appears to them. We learn that we all have X-ray ‘vision’ but that it isn't a terribly useful superpower and discover an even more surprising visual ability that most people are totally unaware they have—the ability to perceive the polarization state of light with the naked eye.

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