Children's Imitation Poetry: What is a cradle and what baby is shaking?

Mother is the cradle, rocking the baby, singing softly, and the baby is asleep.

The schoolbag is the cradle. Shake the pencil baby. Shake the schoolbag gently and the pencil baby will fall asleep.

Wang Yiran: The sea is the cradle, rocking the little turtle. The waves turn gently, and the little turtle falls asleep.