The logic of birdcage tells us that many times, people are dominated by strong inertial thinking: birdcages must be used to raise birds, new houses must be set up before marriage, and society must be divided into three categories. The advantage of this kind of inertial thinking is that it can help us quickly recognize and adapt to the world around us. However, if you go too far, if you extend your inertial thinking to every corner of your life, it will become rigid thinking. If the birdcage is exquisitely designed, it can actually be used as an ornamental; The so-called "naked marriage", the first marriage of two houses, has gradually been accepted by the post-80 s; In the Nordic countries, because the gap between the rich and the poor is very small, the concept of social justice is deeply rooted in the hearts of the people. Therefore, we might as well try to break through the birdcage logic once in a while and spread our thinking. Maybe there is another new world outside the birdcage.