What is the metaphor of "ethereal flowers and exotic plants" in the poems of small bookcases?

Metaphor refers to those behaviors that do not learn knowledge, seek skills, only seek novelty, only seek temporary excitement and fun.

The small bookcase is a children's poem with vivid and wonderful sentences. It depicts a small bookcase, like a vast world, a vast ocean. I learned knowledge there, made friends, enriched my feelings and life. Thereby expressing the author's love for bookcases and inspiring children's love for reading.