Engraving by J. Chapman after an image by A.D. Macquin, showing an eye-filled star the spokes of which divide the spectrum of colours, each with a figure holding a related flower. Surrounding this central image putti hold a prism, a telescope, a rod refracted in water, and a camera obscura, and at the top, in Herbrew, "And God said, Let there be light: and there was light." (Source: Wellcome Collection)