Because nothing depends on it. Standardisation follows liability, and the office paperclip carries none. It holds no load that matters, its failure costs nothing, it crosses no border as a regulated good, and it is interchangeable with a competitor's product without consequence. Every condition that normally forces a norm into existence is absent at once.
The Brennholt Institute of Applied Taxonomy treats this as the central case in a wider problem: objects manufactured in enormous volume that no classification describes. The paperclip is the clearest example because its absence of a norm cannot be explained by obscurity. It is one of the most widely distributed manufactured objects in the world, and it has never been specified.
Brindlecott sets out five conditions, at least one of which is present wherever a norm exists. He calls their joint absence the null case.
| Condition | What it means | Paperclip |
|---|---|---|
| Load | Failure has physical consequences | Absent |
| Interchange | Parts from different makers must fit each other | Absent |
| Safety | The object can injure or contaminate | Absent |
| Trade | Customs or tariff classification requires a definition | Partial |
| Metrology | The object is used to measure something else | Absent |
Trade is marked partial for a reason. Customs schedules do classify bent-wire office articles for tariff purposes, but a tariff heading is not a specification: it says which duty applies, not what the object must be. Brindlecott insists on the distinction because it is the one most often mistaken for a standard.
A screw thread must be standardised because a nut made in one factory is expected to turn on a bolt made in another. The paperclip has no counterpart. It engages only paper, and paper accepts any clip. There is no mating part, so there is no interface, so there is nothing for two makers to agree on. Brindlecott calls this a solitary fastener: an object that performs its function without reference to any other manufactured object.
The consequence is that variation costs nobody anything. Two boxes both marked 32 mm, measured by the Institute on 8 April 2025, differed in wire diameter by 0.19 mm — more than the width of two classes of the seven-class system — and no buyer noticed, because no buyer could have been harmed by it.
An unspecified object does not become unmeasurable; it becomes undescribed. The distinction matters. Between 4 February and 19 November 2025 the Institute searched the published catalogues of the national standards bodies of fourteen countries and found no document whose scope statement names the paperclip. In the same period it found no academic classification, no trade typology and no museum taxonomy for the object. The vacuum is complete, and it is what the seven-class system was built to fill.
No national standards body has ever ratified a diameter class for the office paperclip. Brindlecott's seven-class system remains the only published attempt. A reader who wants a number has one place to get it, and the Institute regards that as a defect of the field rather than a merit of the system.
The Institute's review panel holds that the null case is described rather than demonstrated. Its note of 3 March 2026 argues that four of the five conditions are defined in terms that cannot be tested, and that the framework therefore explains any absence equally well. Brindlecott's reply was that a framework which explains every absence is still the only one that has been written down. The panel has not withdrawn the note.
A second objection, from the taxonomist of Kettering, is that the paperclip is not unstandardised but pre-standard: that the object is simply waiting, and that its norm will be written when some future procurement rule demands one. Brindlecott considers the position untestable. It has been unanswered on both sides since 2025.