How to Design a Hundred-Year Machine
Long-lived infrastructure requires more than durable materials. It needs knowledge and institutions that survive changing generations.
A machine designed to last a century cannot assume its original owners, software, suppliers, or language will remain. Its hardest problem is not resisting weather. It is remaining understandable.
Make the system legible
Short-lived products can hide complexity behind sealed surfaces. Long-lived systems need the opposite. Their important relationships should be visible, documented, and diagnosable with ordinary tools.
Preserve the why
Technical drawings explain what was built. They rarely explain why alternatives were rejected or which assumptions mattered. A living archive should travel with the machine: decisions, repairs, anomalies, and the vocabulary needed to interpret them.
No material eliminates maintenance. The hundred-year machine is hardware joined to a social system capable of caring for something whose benefits outlast the people who approved it.