When asked about the measurement problem in quantum mechanics, he says, “I am just driven crazy by that question. I confess that sometimes I do take 100 percent seriously the idea that the world is a figment of the imagination and, other times, that the world does exist out there independent of us. However, I subscribe wholeheartedly to those words of Leibniz, ‘This world may be a phantasm and existence may be merely a dream, but this dream or phantasm to me
