Consciousness-changing drugs are popularly associated with the evocation of bizarre and fantastic images, but in my own experience this happens only with closed eyes. Otherwise, it is simply that the natural world is endowed with a richness of grace, color, significance, and, sometimes, humor, for which our normal adjectives are insufficient. The speed of thought and association is increased so astonishingly that it is hard for words to keep pace with the flood of ideas that come to mind. Passages that may strike the reader as ordinary philosophical reflection are reports of what, at the time, appear to be the most tangible certainties. So, too, images that appear before closed eyes are not just figments of imagination, but patterns and scenes so intense and autonomous that they seem to be physically present.
by Alan Watts