Observe the lighting …. — Hasn't
it one particular lighting? Like how
doesn't the sentence read
give me one particular impression?
    Observe the particular impr thing
that takes place when you read.
    Impress the lighting of the
room on you.

    Suppose someone said “I am
now observing the particular lighting
it has This would sound as if he
could pr<i>nt out which it was.