It should be : "by which" not "in which".
To give an example, if you look at a painting, the artwork is the painting. The artwork is not your impression or opinion of it.
2015년 4월 1일
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It is a philosphical statement. It says that thing (the artwork) you are looking at (the mental act of apprehending it) is a real thing (the object of) and not something you are imagining ( the mental act in which it is apprehended).
Even to native English speakers this is complete gobbledygook unless you have a basic understanding of philosophy.