Physiosynthesis* is the physical (as opposed to biological) interaction of two or more dissimilar structures that combine to form complex systems. This process occurs throughout the Universe at every order of magnitude and scale. Physiosynthesis is the 'physics' analog to biological symbiosis. String theory suggests that there are tiny vibrational patterns that constitute the smallest known forms of energy. Different 'strings' interact in various ways, producing fundamental particles of energy and matter, such as photons, electrons, and quarks. Electrons and quarks form the structural basis of an atom. Different atoms interact with one another to produce molecules. Atoms also interact with other atoms to form stars. Different molecules bond with one another, creating a variety of small structures and forms such as rocks, minerals, or metals. A variety of molecules combine to form Geo structures such as oceans, mountains, and continents, as well as planetary systems and interstellar objects such as giant molecular clouds that act as nurseries for newborn stars. At an even larger scale, there are examples of astronomical bodies such as galaxies that violently interact through collisions, producing new, more complex, galactic systems. Perhaps even Universes within our theoretical Multiverse may interact, creating an unimaginably gigantic 'Maxiverse'. * Physiosynthesis is an idea first presented in the Nature and Inquiry group by Ron Wallace. The name physiosynthesis is my own.