Sometimes the supposed magician or medicine man himself did the scrying; occasionally he enabled his client to see for himself; often a child was selected as the scryer.
The method of scrying, as generally practised, is simple.
The early church condemned specularii (mirror-gazers), and Aubrey and the Memoirs of Saint-Simon contain "scrying" anecdotes of the 17th and 18th centuries, while Sir Walter Scott's story, My Aunt Margaret's Mirror, is based on a tradition of about 1750 in a noble Scottish family.
Rob also makes lovely, traditional, scrying bowls.
The black scrying mirror, or magick mirror, is a powerful psychic tool.