Solipsism is a philosophical theory, which asserts that nothing exists but the individual’s consciousness. At first it seems silly – and who generally got it into his head completely deny the existence of the world around us? Except when you put your mind to it, it really is impossible to verify anything but your own consciousness.
Don’t you believe me? Think a moment and think of all the possible dreams that you have experienced in your life. Is it not possible that everything around you is nothing but an incredibly intricate dream? But we have people and things around us that we cannot doubt, because we can hear, see, smell, taste and feel them, right? Yes, and no. People who take LSD, for example, say that they can touch the most convincing hallucinations, but we do not claim that their visions are “reality”. Your dreams simulate sensations as well, after all, what you perceive is what different sections of your brain tell you to.
As a result, which parts of existence can we not doubt? None. Not the chicken we ate for dinner or the keyboard beneath our fingers. Each of us can only be sure in his own thoughts.