The seeing of visions or in drug countercultural terms "visuals". The experience may be pleasant or unpleasant, and have as its subject people, objects or simply patterns of light. In delirium tremens or acute alcoholic psychosis the visions seen are terrifying, hence the slang term "the horrors" used to describe this. Yogis refer to seeing "fireflies" as one of the consequences of advancement in Yoga. Also found in schizophrenia.