In 2012, Science Forum created a trippy video of optical illusions designed to produce natural hallucinogenic effects after viewing. I can attest that watching the video does, in fact, trigger temporary dizzying effects (they seem to go away in about five minutes). Be sure to view it in HD and in fullscreen to start the wild optical ride.
Hallucinogens are a general group of pharmacological agents that can be divided into three broad categories: psychedelics, dissociatives, and deliriants. These classes of psychoactive drugs have in common that they can cause subjective changes in perception, thought, emotion and consciousness. Unlike other psychoactive drugs, such as stimulants and opioids, these drugs do not merely amplify familiar states of mind, but rather induce experiences that are qualitatively different from those of ordinary consciousness. These experiences are often compared to non-ordinary forms of consciousness such as trance, meditation, dreams, or insanity.
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