Very few people here (thankfully) have trashed this book as superficial. It isn't. It instead represents a deeply profound and inspirational way of being, especially for those of us who create for a living. Knowing why we do what we do, how we do it, and why it matters is NOT superficial. It's the very essence of us, the truth of us, and Rick Rubin lays it down magnificently.
Let's face it. Anything that delves deep into the ineffable (e.g., what the heart of "creativity" is) is going to be met with some resistance. Mocked for being "hippy-dippy" or some such thing. Bullshit. Because it's the ineffable that makes us human. Feeling something so profoundly that adequate explanations are both impossible and futile.
If you disagree, try explaining to someone why you love a certain person. Or a certain color. Or a certain poem, pet, painting, food, place, or piece of music. Sure, you'll be able to come up with some kind of explanation, though it won't come close to the totality of what you feel for that person or thing. Because when you feel something is true, when you know it's true, no explanation is sufficient. And that, my friends, is what this book taps into. And why I will be returning to it time and time again. Loved it.