Elizabeth Bishop believed that everyone should experience at least one prolonged period of solitude in life. Even if we don’t take so extreme a view as artist Agnes Martin’s assertion that “the best things in life happen to you when you’re alone,” one thing is certain: Our capacity for what psychoanalyst Adam Phillips has termed “fertile solitude” is absolutely essential not only for our creativity but for the basic fabric of our happiness — without time and space unburdened from external input and social strain, we’d be unable to fully inhabit our interior life, which is the raw material of all art.