If the sea is different colours why does every child paint it blue?

purplepoppy
If you look at any child's painting, and most amateur adults you'll notice it's always blue. Now I get that some deprived kids have only seen it on TV and in some American states it's considered a non resistant thing the government made up, but even if a child lives a stones throw from the beach they'll always paint it blue regardless if their local sea is blue, green, grey or brown.

Thoughts
If the sea is different colours why does every child paint it blue?
21 Opinion