HELPPPPPPPP!!!!!!!!!!!!

Consider the pebble that falls from the sky at the end of the story. What does this event symbolize in the real world?

"He-y, Come On Ou-t"
One day, atop the high steel frame of a new building under construction, a workman was taking a break. Above his head he heard a voice shout:“He—y, come on ou—t!”But, in the sky to which he lifted his gaze there was nothing at all. A clear blue sky merely spread over all. He thought it must be his imagination. Then, as he resumed his former position, from the direction where the voice had come, a small pebble skimmed by him and fell on past.The man, however, was gazing in idle reverie at the city’s skyline growing ever more beautiful, and he failed to notice.