John Ruskin's training as an interdisciplinary polymath started in childhood. He learned to memorise the Bible at his mother's knee and published his first poem aged ten. His lifelong fascination with geology found its earliest expression in journal articles from the age of fifteen, while his considerable talents as a draughtsman were developed by leading drawing masters before he was sixteen. Rather than being a prodigy in one particular field, it was his precocious mix of religion, science and art that laid the foundations for the fulfilment of his career as a critic of art, architecture...