Luckily the clock took this moment to tilt dangerously at the pressure of his head, whereupon he turned and caught it with trembling fingers, and set it back in place.

from F. Scott Fitzgerald – The Great Gatsby (Chapter V) on Rap Genius

Meaning

Gatsby fumbling with the falling clock is a metaphor for him clumsily trying to recapture his past with Daisy.

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