Final answer:
The subject of this question is English. The excerpt uses vivid imagery to describe the sea as a blue meadow alive with singing froth-people.
Step-by-step explanation:
The subject of this question is English. The excerpt provided is a piece of poetic language that uses vivid and figurative imagery to describe the sea as a blue meadow alive with little froth-people singing. The language and imagery in this section create a sensory experience for the reader, allowing them to visualize and feel the beauty and liveliness of the sea.