by Oliver Sacks
His checking done, Bennett leaps like a trapeze artist into the plane, revs the engine while I climb in, and takes off. As we climb, the sun is rising over the Rockies to the east and floods the little cabin with a pale, golden light. We head toward nine-thousand-foot crests, and Bennett tics, flutters, reaches, taps, touches his glasses, his mustache, the top of the cockpit. Minor tics, Little League, I think, but what if he has big tics? What if he wants to twirl the plane in midair, to hop and skip with it, to do somersaults, to loop the loop? What if he has an impulse to leap out and touch the propeller? Touretters tend to be fascinated by spinning objects; I have a vision of him lunging forward, half out the window, compulsively lunging at the propeller before us. But his tics and compulsions remain very minor, and when he takes his hands off the controls the plane continues quietly. Mercifully, there is no road to keep to. If we rise or fall or veer fifty feet, what does it matter? We have the whole sky to play with.
And Bennett, though superbly skilled, a natural aviator, is like a child at play. Part of Tourette’s, at least, is no more than this—the release of a playful impulse normally inhibited or lost in the rest of us. The freedom, the spaciousness, obviously delight Bennett; he has a carefree, boyish look I rarely saw on the ground. Now, rising, we fly over the first peaks, the advance guard of the Rockies; yellowing larches stream beneath us. We clear the slopes by a thousand feet or more. I wonder whether Bennett, if he were by himself, might want to clear the peaks by ten feet, by inches—Touretters are sometimes addicted to close shaves. At ten thousand feet, we move in a corridor between peaks, mountains shining in the morning sun to our left, mountains silhouetted against it to our right. At eleven thousand feet, we can see the whole width of the Rockies—they are only fifty-five miles across here—and the vast golden Alberta prairie starting to the east. Every so often Bennett’s right arm flashes in front of me, his hand taps lightly on the windshield. “Sedimentary rocks, look!” He gestures through the window. “Lifted up from the sea bottom at seventy to eighty degrees.” He gazes at the steeply sloping rocks as at a friend; he is intensely at home with these mountains, this land. Snow lies on the sunless slopes of the mountains, none yet on their sunlit faces; and over to the northwest, toward Banff, we can see glaciers on the mountains. Bennett shifts, and shifts, and shifts again, trying to get his knees exactly symmetrical beneath the controls of the plane.
In Alberta now—we have been flying for forty minutes—the Highwood River winds beneath us. Flying due north, we start a gentle descent toward Calgary, the last, declining slopes of the Rockies all shimmering with aspen. Now, lower, to vast fields of wheat and alfalfa—farms, ranches, fertile prairie—but still, everywhere, stands of golden aspen. Beyond the checkerboard of fields, the towers of Calgary rise abruptly from the flat plain.
Suddenly, the radio crackles alive—a huge Russian air transport is coming in; the main runway, closed for maintenance, must quickly be opened up. Another massive plane, from the Zambian air force. The world’s planes come to Calgary for special work and maintenance; its facilities, Bennett tells me, are some of the best in North America. In the middle of this important flurry, Bennett radios in our position and statistics (fifteen-feet-long Cardinal, with a Touretter and his neurologist) and is immediately answered, as fully and helpfully as if he were a 747. All planes, all pilots, are equal in this world. And it is a world apart, with a freemasonry of its own, its own language, codes, myths, and manners. Bennett, clearly, is part of this world and is recognized by the traffic controller and greeted cheerfully as he taxis in.
He leaps out with a startling, ticlike suddenness and celerity—I follow at a slower, “normal” pace—and starts talking with two giant young men on the tarmac, Kevin and Chuck, brothers, both fourth-generation pilots in the Rockies. They know him well. “He’s just one of us,” Chuck says to me. “A regular guy. Tourette’s—what the hell? He’s a good human being. A damn good pilot, too.”
Bennett yarns with his fellow pilots and files his flight plan for the return trip to Branford. He has to return straightaway; he is due to speak at eleven to a group of nurses, and his subject, for once, is not surgery but Tourette’s. His little plane is refueled and readied for the return flight. We hug and say good-bye, and as I head for my flight to New York I turn to watch him go. Bennett walks to his plane, taxis onto the main runway, and takes off, fast, with a tailwind following. I watch him for a while, and then he is gone.
THE VISIONS OF HILDEGARD
The religious literature of all ages is replete with descriptions of “visions,” in which sublime and ineffable feelings have been accompanied by the experience of radiant luminosity (William James speaks of “photism” in this context). It is impossible to ascertain, in the vast majority of cases, whether the experience represents a hysterical or psychotic ecstasy, the effects of intoxication, or an epileptic or migrainous manifestation. A unique exception is provided in the case of Hildegard of Bingen (1098 to 1180), a nun and mystic of exceptional intellectual and literary powers, who experienced countless “visions” from earliest childhood to the close of her life, and has left exquisite accounts and figures of these in the two manuscript codices which have come down to us—Scivias and Liber divinorum operum simplicishominis.
A careful consideration of these accounts and figures leaves no room for doubt concerning their nature: they were indisputably migrainous, and they illustrate, indeed, many of the varieties of visual aura earlier discussed. Singer (1958), in the course of an extensive essay on Hildegard’s visions, selects the following phenomena as most characteristic of them:
FIGURE 1.
Varieties of migraine hallucination represented
in the visions of Hildegard
Representations of migrainous visions, from a MS. of Hildegard’s Scivias, written at Bingen about 1180. In Figure 1A, the background is formed of shimmering stars set upon wavering concentric lines. In Figure 1B a shower of brilliant stars (phosphenes) is extinguished after its passage—the succession of positive and negative scotoma: in Figures 1C and 1D, Hildegard depicts typically migrainous fortification figures radiating from a central point, which, in the original, is brilliantly luminous and coloured (see text).
In all a prominent feature is a point or a group of points of light, which shimmer and move, usually in a wave-like manner, and are most often interpreted as stars of flaming eyes. In quite a number of cases one light, larger than the rest, exhibits a series of concentric circular figures of wavering form; and often definite fortification figures are described, radiating in some cases from a coloured area. Often the lights gave that impression of working, boiling or fermenting, described by so many visionaries . . .
Hildegard writes:
The visions which I saw I beheld neither in sleep, not in dreams, nor in madness, nor with my carnal eyes, nor with the ears of the flesh, nor in hidden places; but wakeful alert, and with the eyes of the spirit and the inward ears, I perceived them in open view and according to the will of God.
One such vision, illustrated by a figure of stars falling and being quenched in the ocean signifies for her “The Fall of the Angels”:
I saw a great star most splendid and beautiful, and with it an exceeding multitude of falling stars which with the star followed southwards . . . And suddenly they were all annihilated, being turned into black coals . . . and cast into the abyss so that I could see them no more.
Such is Hildegard’s allegorical interpretation. Our literal interpretation would be that she experienced a shower of phosphenes in transit across the visual field, their passage being succeeded by a negative scotoma. Visions with fortification-figures are represented in her Zelus Dei (Figure 1C) and Sedens Lucidus (Figure 1D), the fortifications radiating from a brilliantly luminous and (in the original) shimmering and coloured point. These two visions are combined in a composite vision, and in this she interprets the fortifications as the aedificium of the city of God.
“Vision of the Heavenly City”
&nb
sp; Great rapturous intensity invests the experience of these auras, especially on the rare occasions when a second scotoma follows in the wake of the original scintillation:
The light which I see is not located, but yet is more brilliant than the sun, nor can I examine its height, length or breadth, and I name it “the cloud of the living light.” And as sun, moon, and stars are reflected in water, so the writings, sayings, virtues and works of men shine in it before me. . . .
Sometimes I behold within this light another light which I name “the Living Light itself.” . . . And when I look upon it every sadness and pain vanishes from my memory, so that I am again as a simple maid and not as an old woman.
Invested with this sense of ecstasy, burning with profound theophorous and philosophical significance, Hildegard’s visions were instrumental in directing her toward a life of holiness and mysticism. They provide a unique example of the manner in which a physiological event, banal, hateful, or meaningless to the vast majority of people, can become, in a privileged consciousness, the substrate of a supreme ecstatic inspiration. One must go to Dostoevski, who experienced on occasion ecstatic epileptic auras to which he attached momentous significance, to find an adequate historical parallel.43
ISLAND HOPPING
As a child I had visual migraines, where I would have not only the classical scintillations and alterations of the visual field, but alterations in the sense of color too, which might weaken or entirely disappear for a few minutes. This experience frightened me, but tantalized me too, and made me wonder what it would be like to live in a completely colorless world, not just for a few minutes, but permanently. It was not until many years later that I got an answer, at least a partial answer, in the form of a patient, Jonathan I., a painter who had suddenly become totally colorblind following a car accident (and perhaps a stroke). He had lost color vision not through any damage to his eyes, it seemed, but through damage to the parts of the brain which “construct” the sensation of color. Indeed, he seemed to have lost the ability not only to see color, but to imagine or remember it, even to dream of it. Nevertheless, like an amnesic, he in some way remained conscious of having lost color, after a lifetime of chromatic vision, and complained of his world feeling impoverished, grotesque, abnormal—his art, his food, even his wife looked “leaden” to him. Still, he could not assuage my curiosity on the allied, yet totally different, matter of what it might be like never to have seen color, never to have had the least sense of its primal quality, its place in the world.
The text of this selection has been edited slightly from its original form in The Island of the Colorblind.
Ordinary colorblindness, arising from a defect in the retinal cells, is almost always partial, and some forms are very common: red-green colorblindness occurs to some degree in one in twenty men (it is much rarer in women). But total congenital colorblindness, or achromatopsia, is surpassingly rare, affecting perhaps only one person in thirty or forty thousand. What, I wondered, would the visual world be like for those born totally colorblind? Would they, perhaps, lacking any sense of something missing, have a world no less dense and vibrant than our own? Might they even have developed heightened perceptions of visual tone and texture and movement and depth, and live in a world in some ways more intense than our own, a world of heightened reality—one that we can only glimpse echoes of in the work of the great black-and-white photographers? Might they indeed see us as peculiar, distracted by trivial or irrelevant aspects of the visual world, and insufficiently sensitive to its real visual essence? I could only guess, as I had never met anyone born completely colorblind.
Knowing that congenital achromatopsia is hereditary, I could not help wondering whether there might be, somewhere on the planet, an island, a village, a valley of the colorblind. When I visited Guam early in 1993, some impulse made me put this question to my friend John Steele, who has practiced neurology all over Micronesia. Unexpectedly, I received an immediate, positive answer: there was just such an isolate, John said, on the island of Pingelap—it was relatively close, “barely twelve hundred miles from here,” he added. Just a few days earlier, he had seen an achromatopic boy on Guam, who had journeyed there with his parents from Pingelap. “Fascinating,” he said. “Classical congenital achromatopsia, with nystagmus, and avoidance of bright light—and the incidence on Pingelap is extraordinarily high, almost ten percent of the population.” I was intrigued by what John told me, and resolved that—sometime—I would come back to the South Seas and visit Pingelap.
When I returned to New York, the thought receded to the back of my mind. Then, some months later, I got a long letter from Frances Futterman, a woman in Berkeley who was herself born completely colorblind. She had read my essay on the colorblind painter and was at pains to contrast her situation with his, and to emphasize that she herself, never having known color, had no sense of loss, no sense of being chromatically defective. But congenital achromatopsia, she pointed out, involved far more than colorblindness as such. What was far more disabling was the painful hypersensitivity to light and poor visual acuity which also affect congenital achromatopes. She had grown up in a relatively shadeless part of Texas, with a constant squint, and preferred to go out only at night. She was intrigued by the notion of an island of the colorblind, and wondered if I knew of a book called Night Vision—one of its editors, she added, was an achromatope too, a Norwegian scientist name Knut Nordby; perhaps he could tell me more.
Knut Nordby was a physiologist and psychophysicist, I read, a vision researcher at the University of Oslo and, partly by virtue of his own condition, an expert on colorblindness. This was surely a unique, and important, combination of personal and formal knowledge; I had also sensed a warm, open quality in his brief autobiographical memoir, which forms a chapter of Night Vision , and this emboldened me to write to him in Norway, asking how he might feel about coming with me on a ten-thousand-mile journey, a sort of scientific adventure to Pingelap, and he replied yes, he would love to come, and could take off a few weeks in August.
I asked my friend and colleague Robert Wasserman if he would join us as well. As an ophthalmologist, Bob sees many partially colorblind people in his practice. Like myself, he had never met anyone born totally colorblind; but we had worked together on several cases involving vision, including that of the colorblind painter, Mr. I. As young doctors, we had done fellowships in neuropathology together, back in the 1960s, and I remembered him telling me then of his four-year-old son, Eric, as they drove up to Maine one summer, exclaiming, “Look at the beautiful orange grass!” No, Bob told him, it’s not orange—“orange” is the color of an orange. Yes, cried Eric, it’s orange like an orange! This was Bob’s first intimation of his son’s colorblindness. Later, when he was six, Eric had painted a picture he called The Battle of Grey Rock, but had used pink pigment for the rock.
Bob, as I had hoped, was fascinated by the prospect of meeting Knut and voyaging to Pingelap. An ardent windsurfer and sailor, he has a passion for oceans and islands and is reconditely knowledgeable about the evolution of outrigger canoes and proas in the Pacific; he longed to see these in action, to sail one himself. Along with Knut, we would form a team, an expedition at once neurological, scientific, and romantic, to the Caroline archipelago and the island of the colorblind.
PINGELAP
Pingelap is one of eight tiny atolls scattered in the ocean around Pohnpei. Once lofty volcanic islands like Pohnpei, they are geologically much older and have eroded and subsided over millions of years, leaving only rings of coral surrounding lagoons, so that the combined area of all the atolls—Ant, Pakin, Nukuoro, Oroluk, Kapingamarangi, Mwoakil, Sapwuahfik, and Pingelap—is now no more than three square miles. Though Pingelap is one of the farthest from Pohnpei, 180 miles (of often rough seas) distant, it was settled before the other atolls, a thousand years ago, and still has the largest population, about seven hundred. There is not much commerce or communication between the islands, and only a single boat plying the route between them: th
e MS Microglory, which ferries cargo and occasional passengers, making its circuit (if wind and sea permit) five or six times a year.
The text of this selection has been edited slightly from its original form in The Island of the Colorblind.
Since the Microglory was not due to leave for another month, we chartered a tiny prop plane run by the Pacific Missionary Aviation service; it was flown by a retired commercial airliner pilot from Texas who now lived in Pohnpei. We barely managed to squeeze ourselves in, along with luggage, ophthalmoscope and various testing materials, snorkeling gear, photographic and recording equipment, and special extra supplies for the achromatopes: two hundred pairs of sunglass visors, of varying darkness and hue, plus a smaller number of infant sunglasses and shades.
The plane, specially designed for the short island run-ways, was slow, but had a reassuring, steady drone, and we flew low enough to see shoals of tuna in the water. It was an hour before we sighted the atoll of Mwoakil, and another hour before we saw the three islets of Pingelap atoll, forming a broken crescent around the lagoon.
We flew twice around the atoll to get a closer view—a view which at first disclosed nothing but unbroken forest. It was only when we skimmed the trees, two hundred feet from the ground, that we could make out paths intersecting the forest here and there, and low houses almost hidden in the foliage.