 It all really relates to color. The instruments we have in many ways operate just like your eyes do. I mean, when we refer to a space-based view of the ocean, if you think about those beautiful pictures from International Space Station, it's the blue marble. We always call it the blue marble, but the reality is the ocean is a spectrum of color. And there are photosynthetic pigments within phytoplankton that absorb different kinds of green and blue light.