The odd question
Why is the sky blue instead of violet?
Shorter wavelengths scatter strongly, so why does blue dominate our view?
Here's the surprise
Violet light scatters strongly in the atmosphere, yet most people perceive the daytime sky as blue.
What's really going on?
Air molecules scatter short wavelengths of sunlight more strongly than long wavelengths.
The Sun emits different amounts of light at different wavelengths, and human eyes are less sensitive to violet than blue.
Together with other visual and atmospheric effects, this makes the sky appear blue rather than violet.
Think about it
Is the sky blue because the ocean reflects into it?
Reveal the explanation
No. The dominant explanation is scattering of sunlight by the atmosphere.