The “Cylinder Brain” thought experiment is this: Imagine a crazy scientist taking your brain out of your body and placing it in a life-sustaining fluid, and then connecting the brain to a computer that has the ability to imitate your life experience. If this is indeed possible, then how do you distinguish whether the world around you is real or analog?

Materialism believes that the objective world exists objectively. People can only objectively understand it, but cannot subjectively assume its appearance. So what does the objective world look like? In the past, people believed that matter was immortal, and later discovered that positive and negative particles could be destroyed together; scientists said that the universe came from a big bang, but some people said that the universe had several big bangs; some people believe that human nature is good, but there are always people who wage war and be passionate about killing people. Quantum mechanics tells us that we cannot track quantum objects in space and time, so quantum objects cannot be fully understood.

So, what exactly is the objective world? Materialist said that it cannot be described accurately yet, and understanding must be continuously developed. This is called forever tomorrow. Chang Baohua said a comic dialogue, “I invite you for dinner.” Then he reported a lot of dishes. “When do we eat?” “Tomorrow, tomorrow, forever tomorrow!”

There will be many statements about the world in the future. The objective world that materialism can now present to us is nothing more than the current subjective understanding. The real objective world cannot be fully understood by people. If you want to understand the real objective world, you must wait for the forever tomorrow. Should we wait for tomorrow or live in the present?

The benefit of Materialism lies in the fact that if people believe that the world exists objectively then they can explain the source of the alienation of experience (why experience is not what we want), and they will adopt a rigorous attitude, actively explore, and seek greater benefits for mankind. Therefore, the belief in materialism comes from human interests. Without human interests, materialism has no meaning. If another belief can produce the same benefits, then materialism has no advantage. The ideological experiment of the brain in the cylinder seems to be a devastating criticism of science. In fact, it just  once again validate the subjective idealism theory of Descartes and Hume from a special perspective. And this is truly devastating of materialism by subjective idealism. Starting from materialism, it inevitably infers the conclusion of subjective idealism.

On the other hand, starting from subjective idealism, we will infer the conclusion of materialism. Subjective idealism does not recognize the existence of the objective world as transcendental and believes that it must proceed from consciousness. However, from the perspective of consciousness it is also possible to confirm the objecti