Interesting... I can't tell whether it is an optical illusion or not, but are the spheres actually spherical? It almost looks like they are slightly lopsided, just like water drops. Most of the time your spheres appear to be genuinely spherical, but when I look at this image I feel like I'm looking at drops of water reflecting or bending the light around them. Almost like raindrops fallling towards a rainbow sea.
This is NOT A COMPLAINT OR CRITICISM, but a comment on a very different effect from your more common perfect spheres. I like the effect very much. It leave a lot to the viewers' minds and allows them to interpret the image for themselves.