"Forbidden" books on black magic, witchcraft, and ancient religious beliefs all describe this basic materialization process, including solemn warnings to avert the eyes when you materialize an angel or demon through some secret rite lest you suffer from conjunctivitis and the other painful maladies produced by the rays of the EM spectrum. All mythology tells how one should not gaze upon the countenance of a materialized god. Although they lacked proper terminology for these effects and were obliged to speak in terms of "rays" and "vibrations," secret cults throughout the ages knew that entities moved into our reality through a process of altering frequencies."