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Figure: The development and regeneration of zebrafish lateral line sensory organs left, image courtesy of Adrian Jacobo follows universal symmetry-breaking principles that can be represented as state transitions in an effective energy landscape. The Erzberger group uses the tools of theoretical physics to identify fundamental principles underlying the formation of cellular and multicellular structures. Living matter self-organises across temporal and spatial scales ranging from the molecular to the organismal. During embryonic development, for example, cells assemble into complex organs that reliably carry out specific functions. Understanding the principles governing self-organisation is one of the most important goals of both biology and the physics of complex systems. Recent experimental advances have made it possible to observe the development of organs within living embryos, measure the forces exerted by cells, and track the exchange of molecular signals.