The Camera Lucida is an optical device invented in 1807 by the British scientist William Henry Fox Talbot. It consists of a prism that allows an artist to see a scene and their drawing surface simultaneously. This helps in accurately capturing proportions and perspectives while sketching. The device became popular among artists and illustrators for its ability to aid in creating realistic images. It is often considered a precursor to modern photography, as it bridges the gap between traditional drawing and the photographic process. The Camera Lucida remains a valuable tool for artists today.