In which the curious phenomena of colours and luminous apparitions encountered by the ailing or afflicted eye are described with a keen attention to their ephemeral and often vivid nature, revealing how both physiological and pathological states may conjure sparks, after-images, and strange hues without external cause. The discourse then delicately transitions to the contemplation of physical colours, those transient beauties produced through colourless media, inviting us to explore their mutable and elusive character as perceived by the eye.