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anything interposing between pc (thetan) and something he wishes to see, whether mest or mock-up. Fields are black, grey, purple, any substance, or invisible. In any field a pc was effect in an incident where he was being kept from going away. As all fields are incidents, and as a pc is the one who mocks up
these incidents, all fields can be cleared by attaining knowing cause. (HCOB 1 Feb 58)