In recent years there has been a strong development of the concept of virtual reality (VR) which from the first video games developed in the 60s has reached the current immersive systems. VR and the consequent deception of perception pose an interesting question: is it possible to deceive the mind to the point of not being able to recognize whether the perceived reality is real or simulated? In addition to this question, another question arises spontaneously: is it possible to simulate a non-reality in which the physical laws do not apply? The answer to the first question is that it would theoretically be possible to deceive the mind to the point of not being able to recognize whether the perceived reality is real or simulated, furthermore it is also possible to simulate a non-real, i.e. magical, world. However, this possibility is based on hiding degrees of freedom from the observer, therefore it requires the complicity of the observer to be realised. It can be said that a VR system can simulate both a real and non-real experience. For an observer, a virtual reality experience is still an experience of reality. This experience can be exchanged for a different experience, that is, for a different reality that can be real or not real.

翻译：近年来，虚拟现实（VR）概念得到了迅猛发展，从20世纪60年代开发的首批电子游戏，演变至当今的沉浸式系统。VR及其引发的感知欺骗提出了一个有趣的问题：能否欺骗心智到无法分辨所感知的现实是真实还是模拟的程度？除这个问题外，另一个问题自然浮现：能否模拟一个物理定律不成立的非现实？第一个问题的答案是：理论上可以欺骗心智到无法分辨所感知的现实是真实还是模拟的程度，此外，模拟一个非真实（即魔幻）的世界也是可能的。然而，这种可能性基于向观察者隐藏某些自由度，因此需要观察者的配合才能实现。可以说，VR系统既能模拟真实体验，也能模拟非真实体验。对观察者而言，虚拟现实体验仍是一种现实体验；这种体验可以被置换为另一种不同的体验，即一种可能真实也可能不真实的现实。