"Where William Blake found the world in a grain of sand, Gaia finds the planet in a bacterial cell. Bruce Clarke, eminent scholar of literature and science, leads us through the evolution and elaboration of the notion-where complex systems can easily get complicated and cybernetics loopy-with sustained precision and clarity. The necessity to understand is evident throughout."-Douglas Kahn, author of Earth Sound Earth Signal: Energies and Earth Magnitude in the Arts"Gaian Systems is a brilliant labor of love. Intellectual love for a major system of thought and for those who have built it, especially the towering figure of Lynn Margulis. But also profound love for our living planet as a whole, for the complexity and subtlety of the complex assemblages that compose it. Combining rigor with generosity, Bruce Clarke explores the genealogy, the key concepts, and the major implications of a symbiogenetic vision of our planetary system. Humble and yet visionary, this remarkable study instructs, illuminates, and gives us hope."-Rosi Braidotti, Utrecht University