According to Osho, color is not an inherent property of objects but an event between light, the senses, and consciousness. ‘Brown’ appears when a mixture dominated by long wavelengths (orange-red) is seen at low luminance and in contrast to lighter surrounds; the mind constructs this shade and names it.
Brown isn’t in the thing; your eyes see dim orange-ish light against something brighter, and your mind calls that color “brown.”