The walls and ceilings of the great ballroom were of glass, thick but clear. Many hundreds of large mussel-shells, rose-red and grass-green, were set in rows on either side, with a blue flame burning in them that lighted up the whole hall and shone out through the walls, so that the sea outside was all lit up. You could see all the innumerable fish, big and little, swimming round the glass walls.
The scales of some of them shone purple-red, on others they shone like silver and gold. In the middle of the hall there flowed a broad rapid stream, and on it mermen and mermaids danced to their own beautiful singing. Such charming voices no one on earth possesses. The little mermaid sang the most beautifully of them all, and they clapped their hands at her, and for a moment she felt joy at her heart, for she knew that she had the loveliest voice of anyone on earth or sea."