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This bell curve perfectly captures the intellectual journey of understanding why things are blue. The casual observer sees the sky and goes "yep, blue sky." The person who just learned about Rayleigh scattering in their intro physics class becomes insufferable, ready to correct anyone who dares suggest the sky is simply blue without mentioning the wavelength-dependent scattering of sunlight by atmospheric molecules. Then you reach enlightenment and realize that air itself appears blue when you look at enough of it—mountains in the distance, thick atmosphere, same principle, less pretension.
For context: Rayleigh scattering happens because shorter wavelengths (blue light) scatter more strongly than longer wavelengths (red light) when interacting with particles much smaller than the wavelength of light. So yes, oxygen and nitrogen molecules scatter blue light more, making the sky blue. But here's the kicker—if you stack enough air molecules together, like when looking at distant mountains or a thick layer of atmosphere, the cumulative effect makes the air itself look blue. Same physics, different framing, way less annoying at parties.
