Durability

When an escalator breaks, it turns into stairs. Durable objects keep working after their maker stops updating them, the company goes out of business, or the server fails. They can be fixed with common parts and tools, and they let people learn them once and keep that knowledge. These examples are built for years of use, repair, and changing needs. There are also anti-examples here about what happens when durability is not considered in public spaces.

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