The blue you see here is the sky early in the morning, when the sun is white and comes in nearly horizontally from the east.
Here’s a better view…
What is it about blue?
Not when there’s ice involved, at any rate, catching the sky on its surface tensions and carrying it within its body where the light would not go on its own. Light travels in straight lines. Sure, but the intersection with rounded planes is fascinating.
And the sky and the sun are different lights, manifesting themselves differently?
Isn’t it amazing that water can do that?
The rainbow on the right of this chunk of ice illustrates the prismatic effects of Newton’s science of light. For sure, but what if this ice, battered by the wind and the waves, frozen, thawed and refrozen many times, is a prism of a different kind?