A tribute to Vincent van Gogh. Impressionist pictures of riverscapes with white foam reflected in the "blue" water remind me time and again of Vincent van Gogh's wonderful pictures in particular of his famous painting "Starry Night".

Just like the "impressionist" pictures, these photos, too, have been turned upside down to achieve a more realistic look.

I've added a second gallery with photos that are dominated by blue water and yellow foam which - I have to guess - got its yellow hue from the omnipresent sulphur.