The story begins with a great deal of imagery:
With a clamor of bells that set the swallows soaring, the Festival of Summer came to the city Omelas, bright-towered by the sea. The rigging of the boats in harbor sparkled with flags. In the streets between houses with red roofs and painted walls, between old moss-grown gardens and under avenues of trees, past great parks and public buildings, processions moved.
The description of the bells constitutes auditory imagery (images you can hear), and the description of the swallows taking flight, the bright buildings, the sparkling boats, the red roofs, the mossy gardens, the trees, and so on all constitute visual imagery (images you can see). Further, in the first two sentences of the quotation above (the first of the story), slant rhyme is created by the repetition of the "s" sound in bells, set, swallows, soaring, Festival, Summer, city, Omelas, sea, boats, sparkled, and flags . This repetition might remind us of the "shooshing" sound water makes as it comes in...
(The entire section contains 2 answers and 557 words.)