What are the different images that the poet had used in the poem ars poetica?

There are countless sources of imagery that MacLeish put in this poem. One of them is in the first stanza. The "globed fruit" is being compared to a poem. A fruit is juicy and tasteful. For the most part it is known around the world as being a fruit. MacLeish's poem implies that the more literal imagery you have the better your poem is. Which obviously doesn't make any sense. But I guess the poem doesn't really make much sense either =>