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"And from right to left along the lighted shore moved a wild and gorgeous apparition of a woman." (3.13)
The fact that this woman is described as an "apparition" suggests that Marlow does not consider women, especially this native African one, to be as fully human or as capable as men.
"He [Kurtz] rose, unsteady, long, pale, indistinct, like a vapour exhaled by the earth, and swayed slightly, misty and silent before me […]." (3.27)
Kurtz is not a whole man; he is described only as a "vapour," "misty" and insubstantial before the wholly human form of Marlow.
"He [the manager] leaned back, serene, with that peculiar smile of his sealing the unexpressed depths of his meanness." (3.44)
The manager is described with emptiness imagery again; his hollow depths of "meanness" are sealed uselessly by his vacant smile upon learning about Kurtz’s death. As expected, he shows no real emotion at the news.