The universe exists on scales that are unimaginable. Its physics are so strange they slip beyond what the human brain can comprehend. At one extreme, we have the grandest scale, a universe likely infinite in size, containing trillions of galaxies and possibly an endless amount of space and time. At the other extreme, we have the true strangeness of the quantum world, a space where particles drift in a haze of possibilities, existing everywhere and nowhere at once. It is the simple act of observing these particles that forces the universe to choose between them. It is a notion so alien to our senses as humans that it can feel like magic.