The sky is purple, or actually violet the closest association to purple. So it's a bluish violet.
Violet color has a shorter wave length and is scattered most by our earths atmosphere, & the color we see is the one that is scattered most. It appears a light pale blue without any violet because of the way the cones in our eyes work which isn't perfect and can't pick up all the wavelengths that exist.
What we perceive and see in this world isn't actually what it looks like in real life. We only see things that way because of our senses which are limited. We only see what our bodies allow us to see. We can't see ultra violet light but some insects can like bees. In actuality the world you see is filtered by our senses. You are seeing a filtered not true viewpoint. The world looks way different then what you are seeing with your bare eyes. You can't see everything that exists in the world.
I see dead people.