Physicist: Colors exist in very much the same way that art and love exist. We can say, without reservation, that a colorblind person sees colors differently than a colorseeing person. However, some animals have different kinds of cone cells that allow them to see colors differently, or see wavelengths of light that we don’t see at all. It may seem strange that some creatures are just “missing” big chucks of the light spectrum, but keep in mind; that’s all of us (people and critters alike). Making a substance that becomes (what we call) yellow when it’s exposed to (what we call) yellow light is exactly as difficult as creating a substance that turns magenta when exposed to yellow light.