Season 163 - Day 10 of 14
What philosophical theory, popularized by the French philosopher René Descartes, suggests that one's own mind is the only thing that can be known to exist, and that the existence of external objects and other minds cannot be proven?
This belief is often described as the idea that the self is the only reality and that the external world and other people are mere projections or creations of one's own mind.
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