## Definition
“Boojum” has two very different lives. In Lewis Carroll’s 1876 nonsense poem *The Hunting of the Snark*, a boojum is a creature so terrifying that if you encounter one, you “softly and suddenly vanish away” — a surreal, undefined threat that represents the unknown. In physics, a boojum is a real phenomenon: a topological defect in liquid crystals and superfluids, named by physicist David Mermin in 1976 after Carroll’s creature because, as Mermin put it, “it was the only thing that could make a physicist softly and suddenly vanish.” One is poetry; the other is quantum mechanics. Both are about things that disappear.
## Why It Matters
The Carroll boojum is a perfect example of how nonsense literature handles fear. Unlike monsters that can be fought, the boojum cannot be confronted — encountering it means ceasing to exist, not through violence but through erasure. It’s a deeply modern anxiety made Victorian: the fear of simply not mattering, of vanishing without impact. The physics boojum, meanwhile, is equally strange — a point defect where the orientation of liquid crystal molecules changes in ways that can’t be continuously deformed back to normal. It’s a place where the rules break down, where the map doesn’t match the territory. Both boojums are boundary objects: they exist at the edge of what we can comprehend.
## Example
In *The Hunting of the Snark*, the Baker is warned by his uncle: “If your Snark be a Boojum! For then you will vanish away.” The Baker does encounter a boojum at the poem’s end, and he does vanish — leaving only his collar and tie behind. It’s a joke and a metaphysical horror simultaneously. Meanwhile, in a laboratory, a liquid crystal boojum appears as a dark point where light behaves strangely, where the ordered structure of the crystal has a singular defect. You can photograph a physics boojum. You can only imagine a Carroll boojum. Both unsettle in their own way.
## Internet Angle
The boojum is an internet-native concept before the internet existed. “Softly and suddenly vanish away” describes being blocked on Twitter, being ghosted, having your account deleted, or simply losing relevance in an algorithmic feed. The boojum is the content creator who stops posting and is forgotten within a week. It’s the forum that goes offline, erasing years of conversation. Reddit’s r/UnresolvedMysteries sometimes references boojums when discussing people who disappeared without explanation. And in programming, “boojum” occasionally appears as a variable name or error message — a private joke among physicists and Carroll fans who share Venn diagram space with software developers.
## Related Terms
– **The Hunting of the Snark**: Carroll’s nonsense poem, his longest and most ambitious
– **Lewis Carroll**: The mathematician and author who invented the boojum
– **Topological defect**: The physics category the boojum belongs to
– **Liquid crystal**: The material where boojums physically manifest
– **Ghosting**: The modern social phenomenon that resembles encountering a boojum
– **Nonsense literature**: The genre Carroll perfected, where meaning and absurdity coexist
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