Observation Again

Observation becomes the vital aspect of quantum theory since according to the Copenhagen Interpretation, reality (certain aspect of) is realized only when an observation occurs. In other words, without observation, reality does not exist at all - the key point leads to the idealism believes.

However, I am really having a hard time to comprehend the concept of observation by now.
·What does observation really mean?
·What kind activities are qualified as observation?
·Why do we humans have such ability?
·Does any other life form have the ability to observe?
·When one observes (reality is realized for that person), is the reality realized to all others?
·Humans are also made with common matters, so why is one part of universe capable of observing another part.
·If the statement that reality is realized only when an observation occurs is true, then can I say that an observation occurs only when reality is realized? Both observer and observed are made with common matter.
·What is the outcome of an observation, reality or knowledge of reality?
·If two parties observe each other, does it mean the word observation is meaningless since the concepts of observer and observed are no longer separable.

Furthermore, when we say the reality does not exist at all, does it mean:

·Reality actually does exist, but we cannot gain any knowledge of it – i.e. the reality is behind a curtain, therefore, it is equivalent to non-existence.
·Or, reality in terms of attributes is no longer valid - i.e. the classical definitions of attributes are created by man and therefore, they could only be used for measurement (observation). Any men made parameters are subject to idealism since without men, those attributes would not exist.

Why is the reality behind a curtain? Is it because that we as the observer, are part of the system, or is it because the attributes we use to define the reality are not adequate.

We know when we observe, which is the only way we know to gain knowledge, we rely on instrument. So that in the way, any observable attributes such as speed, position, energy etc. are partial projections of the whole reality and only valid for measurement. Human could only comprehend those man-defined parameters.

In fact, an observation to me is the observed interact with observation apparatus. The effect of the interaction is magnified and perceived by an observer. Keep in mind that all three parties (observed, observer and observation apparatus) are in the same universe. No one is above or separated from others.