It is quantitative, but in an abstract way. You see the color "brown" as a reception of a photon of a certain wavelength onto your retina, which is sent to you

It is quantitative, but in an abstract way. You see the color "brown" as a reception of a photon of a certain wavelength onto your retina, which is sent to your brain. Visual perception can be equated to camera perception, but the data isn't represented the same way. Humans are just much better at "analog input" than computers are. When you see things around you, it's natural to try to classify it at multiple levels. In our early formative years, we learn shapes, lines, colours, etc. This said, "Brown" is just a label we put on a the perception of a photo's wavelength, which is quantitative on the light spectrum. All raw data is quantitative. Qualitative data are just the labels we put on it, but if we're going to general intelligence, we can't shortcut learning this way.