By comparison, quantum mechanics denies the existence of certain physical properties independent of measurement. However, it does not deny, as is frequently erroneously claimed, the existence of the physical object itself in the absence of observation. Here are some quotations from those who contributed to the foundation of quantum theory. Any one who is not shocked by quantum mechanics has not fully understood it. I think it is safe to say that no one understands quantum mechanics.
Nobody know show it can be like that.
Feynman We have always had a great deal of difficulty understanding the world view that quantum mechanics represents. At least I do, because I'm an old enough man that I haven't got to the point that this stuff is obvious to me. I cannot define the real problem, therefore I suspect that there is no real problem, but I'm not sure there's no real problem. But an inner voice tells me that it is not yet the real thing. I, at any rate, am convinced that He is not playing at dice.