Top-left lighting is an artistic convention in which illustrations are produced so that the light appears to come from the top left of the picture.

Most people prefer lighting from the left when resolving a convex-concave ambiguity, and this preference is stronger for right-handed people. This is reflected in Roman

Ancient Rome

Ancient Rome was a thriving civilization that grew on the Italian Peninsula as early as the 8th century BC. Located along the Mediterranean Sea and centered on the city of Rome, it expanded to one of the largest empires in the ancient world....

 mosaic

Mosaic

Mosaic is the art of creating images with an assemblage of small pieces of colored glass, stone, or other materials. It may be a technique of decorative art, an aspect of interior decoration, or of cultural and spiritual significance as in a cathedral...

s and in Renaissance, baroque and impressionist

Impressionism

Impressionism was a 19th-century art movement that originated with a group of Paris-based artists whose independent exhibitions brought them to prominence during the 1870s and 1880s...

 art. In cartography, the predominant custom of placing the shadow on the right-hand side of hill profiles was established during the 15th century. Computer interfaces tend to use top left lighting as well, although this trend has gradually shifted more towards light coming straight from the top.