How does Adam Zagajewski use imagery in Self-Portrait?

In lines 21-30, the speaker shifts the focus to himself. Perhaps thinking of his own death, the speaker notes that he is no longer young but then states that others are closer to death than he is. The image of death is carried over into line 22, in which the speaker admits that he enjoys "deep sleep, when I cease to exist." This sense of disconnection from the world is reinforced in lines 23 and 24, in which the speaker expresses fondness for "fast bike rides" on which objects around him "disappear like cumuli [clouds] on sunny days."