"I had long wanted to see "true" indigo, and thought that drugs might be the way to do this. So one sunny Saturday in 1964, I developed a pharmacologic launchpad consisting of a base of amphetamine (for general arousal), LSD (for hallucinogenic intensity), and a touch of cannabis (for a little added delirium). About twenty minutes after taking this, I faced a white wall and exclaimed, "I want to see indigo now--now!" And then, as if thrown by a giant paintbrush, there appeared a huge, trembling, pear-shaped blob of the purest indigo. Luminous, numinous, it filled me with rapture: It was the color of heaven, the color, I thought, which Giotto had spent a lifetime trying to get but never achieved--never achieved, perhaps, because the color of heaven is not to be seen on earth. But it had existed once, I thought--it was the color of the Paleozoic sea, the color the ocean used to be. I leaned toward it in a sort of ecstasy. And then it suddenly disappeared, leaving me with an overwhelming sense of loss and sadness that it had been snatched away. But I consoled myself: Yes, indigo exists, and it can be conjured up in the brain. For months afterward, I searched for indigo. I turned over little stones and rocks near my house, looking for it. I examined specimens of azurite in the natural history museum--but even they were infinitely far from the color I had seen. And then, in 1965, when I had moved to New York, I went to a concert in the Egyptology gallery of the Metropolitan Museum of Art. In the first half, a Monteverdi piece was performed, and I was utterly transported. I had taken no drugs, but I felt a glorious river of music, four hundred years long, flowing from Monteverdi's mind into my own. In this ecstatic mood, I wandered out during the intermission and looked at the ancient Egyptian objects on display--lapis lazuli amulets, jewelry, and so forth--and I was enchanted to see glints of indigo. I thought: Thank God, it really exists! During the second half of the concert, I got a bit bored and restless, but I consoled myself, knowing that I could go out and take a "sip" of indigo afterward. It would be there, waiting for me. But when I went out to look at the gallery after the concert was finished, I could see only blue and purple and mauve and puce--no indigo. That was nearly fifty years ago, and I have never seen indigo again."