Self-reproduction is central to biological life for long-term sustainability and evolutionary adaptation. Although these traits would also be desirable in many engineered systems, the principles of self-reproduction have not been exploited in machine design¹. Here we create simple machines that act as autonomous modular robots and are capable of physical self-reproduction using a set of cubes.

1. Department of Mechanical & Aerospace Engineering, Cornell University, Ithaca, New York 14853, USA
2. Department Computer Science, Cornell University, Ithaca, New York 14853, USA
3. Department of Mathematics, Cornell University, Ithaca, New York 14853, USA
4. Department of Computing & Information Science, Cornell University, Ithaca, New York 14853, USA

Correspondence to: Hod Lipson^1,4 Email: hod.lipson@cornell.edu

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