Some scientists propose the hypothesis that reality is the result of a general hallucination. This means that what human beings experience is not something that actually 'exists', but it is generated by an image created in the brain. It is something similar to the picture of an optical illusion, where you can see two different images according to the way you choose to focus your sight. Is the ballerina spinning clockwise or anti-clockwise? Is the dress white or blue? Are the two lines parallel or curved? Once you and everybody else decide on the ballerina's direction, on the dress color or on the position of the two lines, i.e. once a decision is made on what and how something "is", its reality is set up, and it becomes everybody's experience. As long as there is agreement, a true fact is established. When such agreement is not reached, there is no actuality. Can such weird, astounding hypothesis be acceptable? It might - to some, while to others it sounds absurd. So, can it be all in the mind?
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