TLDR, provided by Claude.ai when I asked for it to be summarized:

The short story "The Drowned Giant" by J. G. Ballard follows the narrator's observations of a giant human corpse that washes ashore near a city after a storm. Initially, the giant's body attracts huge crowds of curious onlookers who climb all over it, treating it as a spectacle and a playground.

As days pass, the giant's body begins to decay and change in appearance. The narrator, who visits the corpse multiple times, notices how the giant's facial features seem to age and corrupt, as if reflecting the progression of time and mortality.

Gradually, people lose interest in the giant, and his body is subjected to various indignities and mutilations. His limbs are amputated and carted away by a fertilizer company and a cattle-food manufacturer. Graffiti, including swastikas, is carved into his skin, and a fire is set on his chest.

Eventually, the giant is reduced to a headless, limbless carcass that no longer resembles a human form. The narrator reflects on how the giant's existence had provided a glimpse into a world of absolutes, and how the remnants of his body, scattered throughout the city, serve as a reminder of his original magnificence.

The story explores themes of human curiosity, the passage of time, mortality, and the way society treats the extraordinary and the unknown. It also serves as a metaphor for the fleeting nature of life and the inevitable decay that follows death.