Usually it's simply called astral vision. The spirit resides in the astral plane during the evocation and the black mirror is used like a window into that realm. I highly recommend the book 'Modern Magick' by Donald Craig. It's a great book for invo/evo cation and High magick in general, regardless of your expierience level. Good luck.
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ILAT ENKI, IMHAS INA LIBBU INE SU'ATI AMELNAKRU MANNU EMU SHU GUSHTUKUL ELI INA DINGIR!
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