Explain
Why the sky is blue in terms of a football crowd
The sky is basically just a football crowd that refuses to let the short-stature blue light find a seat in the stands.
When sunlight arrives, it is like a stadium full of multicoloured supporters, but the air molecules are those overly enthusiastic stewards who insist on shoving the smaller, blue-wavelength spectators out of the aisle and into every available corner of the pitch. While the red and yellow light is tall enough to barge past the molecules unimpeded to reach your eyes directly, the blue light gets intercepted and scattered in a thousand different directions. By the time you look up, the entire stadium is swarming with redirected blue light, making the void look like a Manchester City home game that has been heavily editorialised by the marketing department.
This chaotic jostling continues until the sun starts to dip toward the horizon, at which point the light has to elbow its way through a much thicker queue of atmosphere. The blue light has already been evicted from the main stand by all that extra distance, leaving only the sunset's bruised, orange-faced hooligans to loiter around the exit. It is the atmospheric equivalent of the final train home from London Euston, where the sensible commuters have vanished and you are left staring at a lingering, drunken glow that insists on singing Wonderwall until it passes out.
Where the analogy breaks downAir molecules do not get aggressive about seat allocation and lack the capacity to support a local football club.