A wave on Otama Beach, New Zealand

Great shot, but why is the foam blue?

--Lannie

Thanks you all for the comments.

Lannie, the foam is blue because it's in the shadow. It was mid afternoon, and on that spot the sun was already behind the hills that are just outside the left side of the photo. So the only light that hit the foam was the one coming from the clear sky... which is blue. :-)