Shadowgraphy or ombromanie is the art of performing a story or show using images made by hand shadows. It can be called “cinema in silhouette”. Performers of the art are often called a shadowgraphist or shadowgrapher.
The art has declined since the late 19th century when electricity became available to homes because light bulbs and electric lamps do not give off good shadows and also because cinema and television were becoming a new form of entertainment. Shadows are greatly defined by candlelight and therefore hand shadows were common in earlier centuries.
Information Source: WiKiPedia