Effects actually vary enormously from person to person, and depend a great deal on the contents of the inner psyche. The intensity of sensual impressions is the result of LSD dissolving the conditioning armor most of us have built up which restricts our sense functioning, thereby permitting the full capability of our natural senses. What is actually experienced in the form of imagery and light varies very appreciably from person to person. For example, one may or may not see geometric patterns, depending upon a wide number of factors rooted in the psyche of the individual. Emotional responses to the vivid hallucinations can be wide-ranging, from euphoria and contentment to disturbing feelings of confusion, fear, and despair.
Moods can change profoundly in a short period to time, from excitability to tranquillity.
All of the above effects are the result of opening the unconscious mind. To the ignorant and unprepared, all such effects can happen. When used with intention, all such effects can become part of a valuable learning process. The consequences of LSD use can be deleterious, not merely benign as commonly perceived. Powerful hallucinations can lead to acute panic reactions when the mental effect cannot be controlled and when the user wishes to end the drug-induced state.