The Watchmaker's Spare Part: On the Deliberate Redundancy of the Duplicate URL
In the quiet, lamplit world of a watchmaker’s workshop, there exists a small, unassuming drawer. It doesn't hold the mainspring or the balance wheel—the stars of the show. Instead, it is filled with duplicates. Identical gears, tiny screws, and pinions, all waiting in the wings. To the untrained eye, this is mere clutter, a redundancy. To the craftsperson, it is a vital cache of potential. It is the exact, deliberate duplicate, held in reserve not for its immediate use, but for its profound utility in a moment of unforeseen need.
We harbor a similar drawer in our digital workshops, though we often treat its contents with scorn: the duplicate URL. Conventional wisdom, shouted from the rooftops of SEO guides, tells us to hunt them down and eliminate them with prejudice. They are errors, oversights, fragments of a messy build process. They are the broken links in the chain of our perfect site structure. But what if we paused, and saw them not as mistakes, but as the watchmaker sees that spare part—as a deliberate, calculated redundancy?
Consider the process of a complex site migration or a large-scale content reformatting. The canonical tag is our primary tool, our master blueprint, directing all energy and authority to the one true version of a page. It is the timepiece we set our lives by. But what of the old movement? The duplicate URLs, the old paths that once led to this content, are often hastily redirected away, their existence erased. In doing so, we discard our spare parts.
There is a case for letting a few deliberate duplicates remain, not as live pages, but as dormant, un-canonicalized addresses. They become a kind of digital fallow field. They are placeholders that remember the old architecture, the previous logic. When a new developer, or your future self, is trying to untangle why a certain redirect chain exists or how a section of the site was once organized, these preserved duplicates serve as a map. They are the spare gear that helps you understand the design of the original mechanism.
This isn't an argument for sloppiness. It is an argument for thoughtful preservation. It is the understanding that a URL, even a duplicate one, carries historical weight. It is a marker in the digital strata of your project. By keeping a curated few—properly noindexed, safely tucked away in your robots.txt drawer—you are not polluting the web. You are building a library of your own progress. You are keeping the spare parts that might one day help you repair your understanding of the whole machine, ensuring that when the mechanism of your site grows complex, you have exactly what you need to keep time ticking smoothly.
Notes & further reading
A few pages I came back to while writing this: