What does nature really look like? Scientific instruments enable us to see far more of the physical world than ever before. These devices can register millions of invisible colours, look back in cosmic time some 12 billion years, peer behind and within seemingly opaque barriers such as skin and bone, and capture events that last a mere trillionth of a second. In this volume, images of scientific interest and of beauty are accompanied by Ivan Amato's descriptions, which shed light on the images themselves as well as the technologies that created them.