Why the Ocean Is Blue

Why is the ocean blue? Who made it blue?
Is there a happy person, colouring?
Did someone spill grape juice, or did the sting
Of angry wasps or hornets, piercing through
The ocean's skin, stick underneath like glue
And make it purple? Can you pull a string
To turn things blue? Did angels swoop and sing?
If one of those dudes made it happen, who?

A cherub's cheeks are usually pink,
Not blue, but when they puff their cheeks and blow
A sea change comes, and soon, when colours flow,
It's over with a shudder and a wink.
It doesn't happen just like that, I think,
The ocean turning blue. It's strange, and slow.