4 ideas
The newly rich businessman Kaneda wants the scholar Kangetsu as a husband for his daughter Tomiko. Kangetsu spends his time grinding glass beads for a doctoral thesis on the effect of ultraviolet rays on the galvanic action of a frog's eyeball. The episode shows new commercial money buying social leverage over old-style learned pride, while the learned side turns out to be petty, idle and unable to defend itself.
In the book's closing debates, Kushami's circle argues that Western-style individualism sharpens each person's self-awareness until other people feel like constant friction. They predict that ever-stronger individuality will make marriage untenable and self-destruction attractive. Their point is that the modern freedom to be a distinct self costs the ability to live easily among others.
A cat with no name and no stake in human status reports on clothing, etiquette, scholarship and courtship as if they were the strange rituals of another species. Stripped of their assumed purpose, these customs look arbitrary and self-serving. The cat's own snobbish vanity then turns the mockery back on the observer, so the reader cannot fully trust any position of superiority.
Kushami, the prankster aesthete Meitei and their friends spend their days trading paradoxes, invented quotations, practical jokes and half-digested Western learning. They produce talk rather than work. Kushami himself poses as a scholar but falls asleep over his books. The book treats this idle cleverness as both a real refuge from commercial vulgarity and a cover for impotence in the world.