Imagine you’ve been reading this book on a nice warm summer’s afternoon. Richly deserving of a reward, you crack open a bottle of your favorite brew and pour it into a nice chilled glass. If you’ve done this before you know that if you carefully pour it down the side you’ll wind up with a glass filled mostly with beer and a small foam head. Pour it fast and down the center and you can easily have a glass with a little beer filled mostly with foam. Imagine now someone else has poured it for you, out of sight, and into a dark mug you can’t see through. You have no way of knowing how much is beer
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