|The Vitruvian Man - Drawing by Leonardo da Vinci circa 1490|
Let's take the sense of sight. The visible spectrum is the portion of the electromagnetic spectrum that can be detected by the human eye. Wavelength of red which is at the end of the visible spectrum of light, is 0.8 millimicron. The wavelength of purple which is at the other end is 0.4 millimicron. This means that we can ONLY see the waves between 0.8 and 0.4 millimicron. Weird and interesting part is, this gap is not even a billionth of the whole scale of waves. That's why I believe that there may be numerous things that we are not able to see.
AND SO.. If the waves that are delivered from the human body could be expanded or shrank to a shorter length and thus stay out of this gap, WE CAN BE INVISIBLE. ( I came across this theory in Mehmet Hengirmen's book "TANSIK II".)
This is similar also about the other senses. Some animals developed the sense of smell more than the humans. For example the sense of smell of a greyhound is 1000 times more than us and their organs which are related to smelling is 40 times more developed than a typical human.
After these comparisons it may sound like human beings are simpler than we think and have very limited abilities. At this point I want to share another information. In a human body, just from one single cell, 100 trillion cells are formed. Produced cells have 200 hundred different types and they form organs like heart, liver, lungs and kidneys with very different functions. All these things happen out of a single cell and it is surprising not only because so many things are formed out of it but also they can work in harmony.