Final answer:
In Schoenberg's Pierrot lunaire, the image of "giant black butterflies" is evoked through expressive music and descriptive language.
Step-by-step explanation:
In Schoenberg's Pierrot lunaire, the image of "giant black butterflies" from the poem is evoked by the use of descriptive language and expressive music. Schoenberg employs dissonant harmonies and unconventional vocal techniques to create a dark and eerie atmosphere that mirrors the image of the butterflies. Additionally, the use of fragmented and unpredictable rhythms adds to the unsettling nature of the piece.