There are a lot of objections to idealism. One objection is, “Whose minds is reality made of?” If it’s my mind alone, then we have solipsism: I’m the only one who truly exists—or, at least, it’s my mind that makes up the universe. That way megalomania looms. If reality is made up of all our minds together, though, then there will be a gap between my mind and reality as a whole. Maybe where I see a unicorn, everyone else sees an elephant, meaning there’s an elephant in reality. That threatens to bring us back to skepticism. How can I know that everyone else’s perceptions match mine?
