Before I drew this figure-ground reversal design, I read part 2 several times. It was half black and half white and it couldn’t tell the foreground and background. This reminds me of a poster from a Korean TV series, which is “W Two World”. In addition, according to my understanding, when a painter is painting, he or she should paint according to his or her own feelings. In the end, I found that the painter would not decide that this was the foreground and the background. Only in this way would he not distinguish the foreground and the background. The content of my painting is one side is the entrance to their inner key. The other side is to leave the entrance.