“It’s often stated that LSD causes hallucinations, but that’s not quite true. When a person has a hallucination, he or she believes that everything that he or she sees and feels is real. LSD changes the way people perceive the world around them, as well as what they think and feel, but people on LSD don’t see things that aren’t there. They see what’s already there in a different way, and most of the time, they’re aware that their altered perceptions are caused by the drug. There is an overall sense of happiness and euphoria. Everything is beautiful, interesting and magical. People on LSD often become very emotional and dreamlike. Large doses of may make them feel especially contemplative. They feel that their mind has burst through its normal boundaries, and they often claim to have had experiences that are spiritual or religious, with a new understanding of how the world works.” — Howstuffworks, “How LSD Works.”