Final answer:
Keating instructs to keep poetry alive and expressive, avoiding it becoming stale and lifeless, similar to how a poem's spider, typically seen unfavorably, is portrayed in an intriguing way.
Step-by-step explanation:
After the poem about the cat, Keating advises that one should 'Just don't let your poem be reduced to rigid satin cloth or dead wings carried like a paper kite.' This instruction emphasizes the importance of keeping poetry vibrant, original, and expressive rather than allowing it to become stale and lifeless.
The comparison to a spider which is often perceived negatively, but in the poem possesses an unusual and seemingly unhealthy appearance, suggests that even subjects that are ordinarily unpleasant can be intriguing and dynamic in poetry.
The message is to avoid clichés and to ensure that poetry remains a living craft that reflects the complexity of life and emotions, much like the unexpected portrayal of the spider.
The question refers to a line from a poem and asks for the missing word or phrase that completes the line. The poem mentioned in the question describes a spider with an unusual and unhealthy appearance. The missing word or phrase is 'reduced to rigid satin cloth' or 'dead wings carried like a paper kite.' Keating's advice is to not let your poem be predictable or clichéd.