Seeing Colors Without Seeing Light

The article argues that light itself is invisible and serves only as the medium for sight, not its object. This view, traced to Aristotle and Alhazen, holds that colors are independent of light, which merely enables their visibility. The author contends that this invisibility resolves problems with color constancy—the perception of stable object colors despite changing illumination. Traditional theories explain constancy by the visual system discounting the illuminant's chromatic component, but if light is colorless, no such component exists. Drawing on Husserl's perspectivism, the author proposes that color variations under different lights are perspectival presentations of a single color, analogous to spatial shape variations. This approach avoids difficulties faced by color relationalism, reflectance physicalism, and enactivism.

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Abstract

ABSTRACT This article defends a provocative claim: Light itself is not seen. Proposed by Aristotle, Alhazen, and recently Hilbert and Kalderon, this view regards light as the medium of sight rather than its object. Unlike reflectance physicalism or color relationalism, this medium theory maintains that colors are entirely independent of light, which merely provides conditions for their visibility. I argue that light's invisibility offers a novel solution to problems raised by color constancy. The traditional approach, originating with Helmholtz, explains constancy through “discounting the illuminant”—the visual system estimates illumination and compensates for it to recover objects’ “true” colors. But if light is colorless and invisible, it cannot contain the variable chromatic component that supposedly explains color variations and, thus, cannot be discounted as contemporary models suppose. Drawing on Husserl's perspectivist framework, I propose that chromatic variations under different illuminations are perspectival presentations of a single color property, analogous to how spatial variations present aspects of shape. We perceive stable colors not by discounting a chromatic component attributed to light, but by grasping variations as perspectives on the same objective color. I contrast this approach with color relationalism, reflectance physicalism, and enactivism, showing how it avoids difficulties they face while better capturing chromatic experience.