When, in 1953, Francis Crick asked the question What is the structure of DNA? he forever transformed our understanding of life itself. Now, 31 years after he received the Nobel Prize, Crick turns his formidable mind to the task of understanding human consciousness and asks what makes us sentient beings? Bent on understanding the complexities of the brain, just as he unravelled the structure of the genetic code, Crick narrows his focus to visual consciousness. The result is an analysis and a detailed description of how the brain sees.