When the thought of the golden key returned, the boy very wisely proceeded to mark out in his mind the space covered by the foundation of the rainbow, in order that he might know where to search, should the rainbow disappear. It was based chiefly upon a bed of moss.
Meantime it had grown quite dark in the wood. The rainbow alone was visible by its own light. But the moment the moon rose the rainbow vanished. Nor could any change of place restore the vision to the boy’s eyes. So he threw himself down upon the mossy bed, to wait till the sunlight would give him a chance of finding the key. There he fell fast asleep.
When he woke in the morning the sun was looking straight into his eyes. He turned away from it, and the same moment saw a brilliant little thing lying on the moss within a foot of his face. It was the golden key. The pipe of it was of plain gold, as bright as gold could be. The handle was curiously wrought and set with sapphires. In a terror of delight he put out his hand and took it, and had it.
He lay for a while, turning it over and over, and feeding his eyes upon its beauty. Then he jumped to his feet, remembering that the pretty thing was of no use to him yet. Where was the lock to which the key belonged? It must be somewhere, for how could anybody be so silly as make a key for which there was no lock? Where should he go to look for it? He gazed about him, up into the air, down to the earth, but saw no keyhole in the clouds, in the grass, or in the trees.
Just as he began to grow disconsolate, however, he saw something glimmering in the wood. It was a mere glimmer that he saw, but he took it for a glimmer of rainbow, and went towards it.—And now I will go back to the borders of the forest.
Not far from the house where the boy had lived there was another house, the owner of which was a merchant, who was much away from home.