This question is a brain trick, which is homophonic with "digital camera", so it is said that "a tree is like a chicken"

Brainstorming originated in ancient India. It means that when thinking encounters special obstacles, you should quickly leave the habit of thinking and think about the problem from other aspects. Now refers to some intellectual questions that can't be answered by the usual way of thinking. Brainstorming covers a wide range: educational, funny, mathematical, adult and so on.