What follows is a tour of Gaia theory, with texts by James Lovelock and accompanying graphics by Sara Mathews, helping to render the material accessible to the layperson. They are reprinted with the kind permission of Gaia Books, and are taken from Gaia: The Practical Science of Planetary Medicine, by James Lovelock, from 1992, with reformatting and editing for online display. The text is now twenty five years old, so some of the data cited is no longer current: for example, on the first page it is noted that atmospheric methane is 1.7ppm (parts per million), but methane has risen since that time to >1.8ppm, largely from human-driven emissions. Despite this, the text remains remarkably contemporary and fresh.