In the life before, I held a layman’s view of light. I considered it to be a substance much like water: you could bathe in it if you took off your clothes, and when you opened curtains it streamed in. You would always be able to see it with your eyes; if you could not, it was not there.
From such feeble, poetic notions I have been brutally disabused by the physics lesson that has incubated in my skin.
Light is the smiling blue-eyed daughter of a family of ruffians—superficially innocent, but sharing many traits in common with her wilder relations. Gamma rays, X-rays, ultra-violet rays, microwaves and radio waves are the fellow members of her tribe—self-perpetuating electromagnetic disturbances that travel from their point of origin at great speed and across great distances, falling off only gradually in strength. Humans on earth can detect waves from the very edges of the universe, and it is not impossible that other intelligences, in other galaxies, are listening, albeit with several years’ delay, to Radio 4.
The speed of all electromagnetic waves is the same. It is a constant, most commonly referred to as the speed of light, around 300,000 km a second in a vacuum. According to the theory of relativity, it is the maximum speed that is possible, in this universe, with this set of physical laws.
Electromagnetic waves each have a particular frequency and wavelength; it is these that give each kind of wave its own peculiar properties, the frequency always decreasing as the wavelength gets longer. Gamma rays have the highest frequency (around 1022 cycles per second) and the shortest wavelength (10-14 metres). If the human body is exposed to gamma rays, the DNA in its cells is damaged, and cancers will form. X-rays also penetrate the body, but are not harmful in small doses, and can be put to practical use. The wavelengths of microwaves are measurable in centimetres. They are the workhorses of the telecommunications revolution, whizzing between mobile phones, masts, laptops and Wi-Fi transmitters, carrying data as streams of noughts and ones. Radio waves are longer and more languid, their waves measuring tens or hundreds of metres between peaks. They are the frequency of choice for television and broadcasting, snaking across the country bearing collective information and entertainment.
Light sits on the electromagnetic spectrum between X-rays and microwaves, occupying a narrow band. Its wavelengths are measurable in nanometres, one nanometre being one thousand millionths of a metre. It has the unique property among electromagnetic waves of being visible to the human eye. In fact, it stimulates the retina across a rainbow of seven colours, from violet light (with a wavelength of 400 nanometres) to red light (with a wavelength of 760 nanometres). We perceive white light when the different colour wavelengths are all equally present, so that the different colour-sensitive receptors in our eyes are stimulated to the same degree.
The strength of an electromagnetic wave is always 1 divided by the distance from its source. This is a quantity that gradually reduces, but which will never get to zero. These waves do not disappear; they merely become too weak to register on human detection equipment. They pass, to varying degrees, through material barriers, suffer degrees of diminution in strength, and yet, in their essential nature, persist.
This persistence, above all, is what I discovered as I started my journey into the dark. At first I thought that clothes would solve it, that it was a matter of the wearing of long-sleeved, high-necked, long-skirted garments, in opaque material.
But the light—even indoor light—got through.
So I began to wear layers of clothing—lined jackets over long-sleeved T-shirts, full-length double-layered skirts over black leggings and knee-high boots. It was an intriguing, retro, mildly Edwardian look; I found the best fabric for my long skirts was a densely woven silk, and for my fitted jackets, velvet or corduroy.
But it was not enough.
I discovered that fabric protected better if it was not tightly pressed to the layers beneath, so my silk skirts became tiered and full so they did not cling around my legs, and I swapped my leggings for under-trousers, like Victorian pantaloons.
But it was not enough. The light got through. Beneath my complicated finery, I still burned.
Through horrible experiment, I learnt that walls were what I had to wear, that there was no alternative to walls, that walls, from this point on, would be my perpetual outer garment, my solitary fashion statement, my signature look.
Did I give up too soon? I would gladly have worn a burka in the streets of my small town, if there had been any point. I thought sometimes of armour, or the costume of a Dalek. Would such casings have worked? Perhaps they would not have been too heavy and uncomfortable, the neighbours would have grown accustomed to a shiny, ponderous figure clanking among the hedges and parked cars, no teenage gangs would taunt or knock it over, and after the first YouTube sensation the world would let it make its way in peace.
But by the time I contemplated such extremities, I was worn out by pain, astonished by the incredible level of my own sensitivity, terrified of doing anything to increase it. I could no longer afford to be the subject of my own experiments; I slipped between the walls of my dark room with nothing but relief.
Inside my room, I dress every day in a long-sleeved top and velvet jacket, pull on my pantaloons underneath my silk skirt, slip on socks. I find, by now, that even in darkness I cannot wear less (because darkness, of course, is not true darkness, is not a total absence of light).
So there I sit, a sumptuous creature, all set to be the heroine of a novel by Sir Walter Scott, or some other Gothic tale, involving dungeons, dark towers, wicked uncles, imperilled innocence and rustling silks.
In the winter, spring and autumn my layers would be practical enough. In the summer, when the temperature climbs towards 86°F and the sun slams down on the roof and thunders against the walls, and the air in the sealed-up room grows inexorably hotter, as if the black room were a clay pot in an oven and I the meat inside, and I cannot open a window to let in the smallest breath of new air, because the light would get in too, and I cannot strip off my finery, even though my body is cooking, because if I unwrap my flesh I will burn, even through the sealed-up windows and the stopped-up door—in the summer, I lie on the floor, inert, in the lowest, coolest part of the room, and I sweat, and I sweat, and I sweat, and the heat builds day on day, as the heatwave goes on, with no sign of a break in the weather (I listen to every forecast), and I know what it is like to be in hell.
In such situations, life simplifies. Psychological niceties melt away; I abandon the luxury of higher, complex emotion. Nothing is important except physical survival, and to that end everything can be sacrificed: dignity, hygiene, self-respect, activity, visitors (who would simply add to the heat and fetidity), the occasional indulgence of tears. Ice becomes my friend—I freeze plastic bottles of water and surround my body with them, as though packing ice around a corpse. Small electric fans push over me the heavy, baking air.
Late in the evening, when the lazy sun has finally slid below the horizon and the sky is the deep blue of summer nights, I risk going downstairs for a while. Pete goes into the hot black room, pulls back the curtains, raises the blinds and opens one window. He wheels in an air-conditioning unit, pokes out of the window its long flexible white hose, plugs it in and switches it on.
The temperature display shows the temperature in the room is 77°F. By the time I come back up, the air conditioning dismantled and the room resealed, that has reduced to 70°F, not a huge improvement, but still blissful, for me.
I hold to one certainty: that the earth beneath me is turning, and the season of heat must pass, and I will have several months in which to forget, before my inferno returns.