Reverse thinking, also known as reverse thinking or divergent thinking, is a way of thinking about seemingly conclusive common things or opinions. Dare to "do the opposite", let thinking develop in the opposite direction, conduct in-depth exploration from the opposite side of the problem, establish new concepts and shape new images. When everyone is thinking in a fixed direction, but you are thinking in the opposite direction alone, this way of thinking is called reverse thinking. People are used to thinking about problems and seeking solutions along the positive direction of things. In fact, some problems, especially some special problems, may be simplified by deducing from the conclusion, thinking backwards, solving the known conditions and thinking backwards.