What is the climax in the poem, Lepidopterology?

The turning point or climax of the poem, Lepidopterology, occurs in line 17, with the introduction of Georg Stiernhielm (1598-1672), a late-Renaissance writer and scholar known as the father of Swedish poetry. Writing that Stiernhielm's poem, The Silk-Worm, established him as the founder of Swedish lepidopterology, the speaker suggests that this poem is the unexpected and dramatic event described in lines 15 and 16. Then, in lines 19 and 20, the speaker says that psychology "took a great step forward" in Stiernhielm's poem, by turning into a butterfly and establishing itself as a science.