Science of Color Perception - The Deep Talk - Dr. Sandeep Kaur - Gautam Kapil

The colors that define daily life feel like unshakeable facts embedded within the physical world. Leaves are green, the open ocean appears deep blue, and a fresh apple presents a vivid red skin. Yet modern optical physics and sensory physiology reveal that reality outside the skull contains no inherent paint, tint, or shade. What humans experience as vibrant hues is an internal biological interpretation constructed from reflected radiation. On an episode of The Deep Talk broadcast on Radio Haanji 1674 AM, host Gautam Kapil joined Dr. Sandeep Kaur to investigate the science of color perception. Moving beyond everyday aesthetic assumptions, their discussion unpacked how electromagnetic energy emitted by the sun travels across space and gets translated by ocular receptors and neural pathways into our subjective visual spectrum. Understanding this pathway requires connecting planetary atmospheric physics with cellular neurobiology. By examining how wavelengths scatter across air molecules, how surface chemistry dictates absorption, and how photoreceptors relay electrical impulses, the episode showed that color is not an objective property of the universe, but a perceptual bridge built between physics and cognition.