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Such exist in reality it is independent from my observation, is the assumption. Only know the reality, I am conscious of my sense is, so I assume when you introduce the concept of the real presence of external object is to cause a sensation of these.             External Reality       As I look around the room where I am now sitting I see various objects. That is, through the lenses in my eyes, through the structure of the retina, through assorted electrical impulses received in my brain, etc, I experience sensations of colour and shape which I interpret as being caused by objects outside myself. These objects form part of what I call the ‘real world’ or the ‘external reality’.   That such a reality exists, independent from my observation of it, is an assumption. The only reality that I know is the sensations of which I am conscious, so I make an assumption when I introduce the concept that there are real external objects that cause these sensations. Logically there is no need for me to do this; my conscious mind could be all that there is. Many philosophers and schools of philosophy have, indeed, tried to take this point very seriously either by denying the existence of an external reality, or by claiming that, since the concept cannot be properly defined, proved to exist, or proved not to exist, then it is useless and should not be discussed. Such views, which as philosophic theories are referred to by words such as ‘idealism’ or ‘positivism’, are logically tenable, but are surely unacceptable on aesthetic grounds. It is much easier for me to understand my observations if they refer to a real world, which exist even when not observed, than if the observations are in fact everything. Thus, we all have an intuitive feeling that ‘out there’ a real world exists and that its existence does not depend upon us. We can observe it, interact with it, even change it, but we cannot make it go away by not looking at it. Although we can give no proof, we do not really doubt that ‘full many a flower is born to blush unseen, and waste its sweetness on the desert air’.         — Euan Squires, The Mystery of the Quantum World               Indexes/01