Scyphomancy

Scyphomancy (Gk. "skýphos", cup, or drinking bowl, and "manteia", divination) is divination using a cup or goblet. This may involve forecasting or representing by using a cup of water and reading the signs specified by certain articles floating on the water. It is considered one of the oldest methods of foretelling the future by means of crystalline reflection, both in ancient Egypt and Persia.
Description.
American folklorist Charles Godfrey Leland describes it in his 1891 book "Gypsy Sorcery and Fortune Telling", in relation to the ritualistic practices of the Roma: