What metaphors are used in The Selected Poetry of Rainer Maria Rilke by Rainer Maria Rilke?

In the poem, The Bird Feeders, the poet emphasizes their value. He also discusses how they indicate a certain wisdom. He mentions how it is that only birds go to bird feeders. There are two paragraphs. The second one begins, "Only don't ask the women anything when you see them feeding the birds." The author uses the process of feeding birds as a metaphor as a way of interpreting one's relationship with God and also with the reality as a writer of "fleeting experiences."