2. In the abstract, "swimming in the sky" means that the flame is blazing, the picture is full of fire, and the goose has wings for the fish to swim in the water.
3. Avant-garde: "wild geese and fishermen" (homophonic), both geese and fish are sold in plural
4. Modern: fish O bird (O is the sound of oh, which is my word on the left of the word goose, and the overall pronunciation and meaning can be understood by yourself)