But
it might seem to you
you might think
that you can look at the partic. lighting of this room. As though you didn't look at the room but at something else which the room had. And you are then in fact concentrating your attention … on the lighting which doesn't mean to look at a part. thing but in a part. way.
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  (I must try to cheat myself to believe that I can look at the part. lighting of this room.)