This story is classified in the science fiction section so, yes, it is not at all realistic. If a story that is pure science fiction is unappealing to you, you should not read this story as you will be very disappointed. Invisibility is, of course, not feasible (the rationale and mechanisms for the invisibility in the current story was obtained through The Invisible Man and subsequently related publications). All of the persons depicted in this story, each of the men and women, are at least eighteen years old. I again thank StoryPal for his very, very helpful editing and suggestions.
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Griffin was an undergraduate student at Livingston College. He worked for Dr. Kemp, a physics professor who studied optical densities. Optical density is an expression of the transmittance of an optical element for a given wavelength. The higher the optical density, the lower the transmittance. There were many interesting things you could do with the manipulation of optical densities. Dr. Kemp was experimenting with a transfiguration that would alter the refractive index of light reflecting from organic matter, thus ensuring that light would not bend when passing through, thereby making the cloaked organism effectively invisible.
It was quite the discovery, to say the least. Dr. Kemp, however, could not, of course, claim full credit. Drs. Graeme Milton at Utah University and Nicolae Alexandru Nicorovici at Sydney University of Technology had conducted the most significant preliminary studies. They developed a cloaking device that relied on recently discovered materials used to make super lenses that make light behave in a highly unusual way. Instead of having a positive refractive index, the property which makes light bend as it passes through a prism or water, the materials have a negative refractive index, which effectively makes light travel backwards. When objects are placed behind these super lenses, the light bouncing off them is essentially erased by light reflecting off the lenses, making the object invisible.
Sir John Pendry, a theoretical physicist at Imperial College of London who invented super lenses, said, "Effectively, they are making a piece of space seem to disappear, at least as far as light is concerned."
The key contribution of Dr. Kemp was to produce the lens in a liquid form that adhered and affected only organic matter, thus being able to effectively cloak an organism. He began with the cloaking of small organisms, including the proverbial laboratory mouse, a rhesus monkey, a dog, and even a bird. The cloaking of a parakeet had been a little problematic, as it escaped the cage. He and his assistants were a little concerned about being able to catch the canary, until droppings began to fall out of thin air. Any fluids released by the organism would not themselves be invisible, as they were no longer within the boundaries of the cloak.
There was one limitation though with its application to organisms. As the Russian physicist Dr. Yakov I. Perelman had demonstrated, a person made invisible by Dr. Kemp's method would also be blind, since a human eye works by absorbing incoming light. If the light was refracted, no information would reach the retina.
It was not, however, in insurmountable problem. One would just not coat the corneas, a procedure that had never actually worked that well anyway. The lab animals really didn't seem to like the ointment on their eyes. So, one could just coat the eyelids. If one's eyes were closed, one was invisible. If one opened one's eyes, all that could be seen were two eyes, seeming to float in the air.
Of course, two floating eyes would attract a bit of attention. However, this wasn't a serious problem. The simplest solution was to just place your fingers before your eyes and peek out in between the very small slits of mostly closed fingers. The cloaking would then wrap around the entire body, revealing the refracted light that was behind the body, rather than just behind the fingers. Children often play peek-a-boo this way, feeling like you can't see them when they're covering their eyes with their hands. Well, in this case it was really true. Another person could only barely detect your eyes through your slightly spread fingers, but you could still see quite a bit. It was like having a mobile peep hole, allowing you to peek into (or actually within) any room one wanted. And, if one found that to be too cumbersome or restrictive, one could also hide behind hanging curtains, garments, towels, blankets, or anything else that was sufficiently diaphanous, the only risk being if one's eyes were evident behind the material.
Another difficulty was that the ointment, when wet, was readily removed by rubbing against an object, exposing part of the body and in turn turning that which one was bumping or rubbing against invisible (as long as it was organic material).
However, this was eventually resolved by revising the formula so that it would maintain its effectiveness upon drying, effectively then sealing the body in a resilient invisible cloak. Not surprisingly, however, it would not last forever. In fact, it would wear off in a couple of hours, which did limit its potential. Dr. Kemp was working on a more sustained version.
It was a tremendous relief to Griffin though that it did last only a relatively short period of time when he volunteered to be the first human to be cloaked. Dr. Kemp did not want to go through the Livingston's ethics board to recruit undergraduates as guinea pigs or, as they would be described in the protocol, experimental subjects. For very obvious reasons he wanted to keep the device secret as long as possible. He could not risk the chance of revealing its existence too soon. In addition, and perhaps more honestly, Dr. Kemp wasn't too sure that he could even get the board's approval to conduct a study with humans. He wouldn't be able to assure them that there were absolutely no risks, and it wouldn't be too surprising to discover that they felt that coating the entire body in a cloaking cream must have some potential negative consequences.
So, Dr. Kemp was going to try it on himself, but Griffin convinced him that it was best for it to be somebody else, in case something did go wrong.