Oh, but it is dirty!
-- Speaker (Line 1)

Importance: The opening line is an exclamation over how dirty something is. The use of the word "oh" as well as the exclamation point emphasize the speaker's distaste. This dirtiness will be the poem's main focus until the last few stanzas.

oil-soaked, oil-permeated / to a disturbing, over-all / black translucency. / Be careful with that match!
-- Speaker (Lines 3-6)

Importance: These lines designate a moral as well as physical judgement over the dirtiness that the speaker observes. The word "disturbing" in particular emphasizes this, as well as the fact that blackness is commonly associated with evil. The last exclamation shows that the speaker considers the scene to be dangerous.

Father wears a dirty, / oil-soaked monkey suit.
-- Speaker (Lines 7-8)

Importance: Here, the speaker introduces the character of "Father." The lack of a definite or indefinite article gives this character a universal quality, or at least suggests that the speaker knows him. Like his surroundings, the father...