By comparing the narrator's sentiments with "a little seesaw of the right throbs and the wrong," the writer creates a mood of uncertainty.
The positioning and movement that the seesaw assume are what reinforce the narrator's uncertainty. This uncertainty is even more highlighted when the narrator shows that the seesaw is composed of concepts of right and wrong.
This highlights how the narrator's feelings are contradictory, disharmonious, and inconclusive, which prevents him from thinking clearly and having an accurate view of the situation in which he is inserted.
The result of this is that the narrator finds it difficult to be sure, and uncertainty drives his thoughts and decisions. This uncertainty is so strong that it is transmitted to the reader, thus creating the mood of the text.
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