The document discusses principles of lighting, including direction of light and its effects. It describes how front, side, back, top, and bottom lighting can influence the appearance of subjects by altering shadows, textures, and forms. Certain lighting directions like side lighting are generally attractive by revealing details, while others such as bottom lighting can create strange and unfamiliar looks by reversing typical light and shadow patterns. The document advises considering features of light like direction, quality, contrast and color when taking or analyzing photographs.