Travel can see the world, but what you can see is really too little. It takes so much time and energy to see only the superficial things. Or get a vanity from the heart. Traveling to the real world takes a lot of money and time, but the brain doesn't need much; You don't need any financial support to travel to the world of ideas, but you need to calm down and discover the world here with thinking and discover more novel things. In contrast, many people want to travel just because they are too poor and hope to enrich their experience through travel; But unfortunately, they only see the external experience; But I don't know that the real experience comes from the heart. Of course, it does not rule out that some people stay in the ideological world for too long and want to go outside to see the difference between the ideological world and the real world.