Rosenwald sheets

The Rosenwald sheets are a set of three printed sheets of playing cards from the 16th century which function as a rudimentary scrying engine.

The Rosenwald sheets function as a matrix (mathematics for simple scrying engine routines.

The scrying engine effect is assumed to be a form of the Gnomon algorithm.

Fiction cross-reference

• Gnomon algorithm
• Scrying engine

Nonfiction cross-reference

• Matrix (mathematics) (nonfiction)
• Playing card (nonfiction)