We are all aware that the senses can be deceived, the eyes fooled. But how can we be sure our senses are not being deceived at any particular time, or even all the time? Might I just be a brain in a tank somewhere, tricked all my life into believing in the events of this world by some insane computer? And does my life gain or lose meaning based on my reaction to such solipsism?
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Project PYRRHO, Specimen 46, Vat 7
Activity Recorded M.Y. 2302.22467
TERMINATION OF SPECIMEN ADVISED
There are no facts, only interpretations. -- Friedrich Nietzsche
Ideas and thoughts are the only things that can be directly experienced. All you know about the world consists of memories of experiences.
It's very much the same as being unsure if you're dreaming. How do you know you're not asleep?
It's a monistic view (As opposed to dualistic) and the oposite of materialism (also monistic).