Rising sun: refers to the rising sun shining on the door. It is said that "the cock crows all over the world", and the cock crows in the morning.

Guessing mainly refers to insinuating things or words for people to guess, and can also be extended to things with mysteries. The riddle originated from the ancient folk in China, and it has evolved for thousands of years. It is a cultural product created by the collective wisdom of the ancient working people in China. As an educational, leisure and entertainment activity that ancient working people loved very much. It is not only widely spread in writing, but also widely spread in spoken language. Almost everyone can say several or even dozens of riddles.