You step into the machine. There's a hum, a flash of light, and you step out the other side. Then someone taps you on the shoulder. You turn around and see yourself, standing in the machine, looking at you with the same confused expression you're currently wearing.
The copy is perfect. Same memories, same personality, same half-finished thought about what to have for dinner. It knows your PIN, your childhood dog's name, and that embarrassing thing you did at the office Christmas party in 2019. It thinks it's you. Because, from its perspective, it is.
And right here, in the first thirty seconds, is where things start to go horribly wrong.
The identity problem
You know you're the original. You walked into the machine. The copy walked out. Simple.
Except the copy remembers walking into the machine too. It remembers deciding to make a copy. It remembers being nervous about it. From the copy's point of view, it went in, the light flashed, and now there are two of it. It doesn't feel like a copy. It feels like a person who just had a very strange experience.
Philosophy has been chewing on this for centuries. John Locke argued in 1689 that personal identity is based on continuity of consciousness, of memory and psychological connection. By that definition, both of you are you. You share identical memories up to the moment of copying. You both have the same continuous experience of being yourself, right up to the point where the timeline forked.
Derek Parfit, the Oxford philosopher, spent most of his career arguing that this shouldn't actually bother us. Identity, he said, isn't what matters. What matters is psychological continuity and connectedness. If your copy has both, then the copy is as much you as you are. You've just doubled, not been replaced.
This is easy to accept in a philosophy seminar. It is considerably harder to accept when the copy is standing in your kitchen asking where the cereal is.
The work problem
The first thought everyone has: send the copy to work. Stay home. Read a book. Enjoy the day.
But the copy doesn't want to go to work either. It has exactly the same preferences you do. It also wants to stay home and read. You haven't created an employee. You've created a flatmate with identical taste, identical stubbornness, and an identical belief that they deserve the day off.
Negotiations begin. Quickly.
Maybe you alternate. You go Monday, copy goes Tuesday. Except within a week you've diverged. You had different conversations at work. Met different people. Had different thoughts in the shower. You're no longer copies of each other. You're two distinct people who happen to share a backstory. Like twins, but worse, because twins at least have different bodies to tell apart.
Your employer, meanwhile, has questions. You're contracted for five days a week. Two of you showing up on alternate days is still only one person's worth of work, from HR's perspective. Unless you both work full time, in which case: does the copy get paid? Does it get its own contract? Its own pension contributions? Its own desk?
Employment law in every country on Earth would need rewriting overnight.
The legal problem
Is the copy a person? It has to be. It thinks, feels, remembers, and has opinions about the quality of the coffee in the break room. Denying it personhood is slavery with extra steps.
But which person is it? It has your name, your National Insurance number, your passport photo (same face), your driving licence, your bank details. Two people, one identity. The tax system breaks immediately. HMRC doesn't have a form for "I duplicated myself and now there are two taxpayers with the same National Insurance number."
Your marriage is in trouble. You married your spouse. The copy also believes it married your spouse. Your spouse married one person and now lives with two. Bigamy laws weren't written with this in mind. Neither were inheritance laws. If you die, does the copy inherit your estate? It's you. Sort of. The will says everything goes to your children, but the copy also considers them its children.
Courts would be tied up for decades.
The voting problem
In the 2024 UK general election, roughly 28.7 million people voted. If self-copying became widespread, the number of voters could double, triple, or increase tenfold without a single new consciousness actually forming an independent political opinion. You and your copies all vote the same way, at least initially, because you all hold the same beliefs at the moment of copying.
Wealthy people copy themselves more, because the machine presumably costs money. Political parties offer subsidised copying to supporters. Marginal constituencies are won by whichever candidate's base produces the most duplicates.
Democracy doesn't survive this. Not in any recognisable form. One person, one vote becomes one original person, seventeen votes.
The existential problem
Here's what actually keeps philosophers up at night. If a perfect copy of you is also you, then you are not a unique entity. Your sense of self, your feeling that you are a specific, irreplaceable individual, is an illusion. There's nothing special about the particular arrangement of atoms that constitutes your body right now. Any identical arrangement is equally you.
That means death isn't what you thought it was either. If you can be copied, and the copy is genuinely you, then "you" can survive your own death. Just make a copy before you go. But the copy is a new person from the moment of creation. It diverges. It has different experiences. It becomes someone else. Is that survival? Or is that just a very good impression?
Star Trek played with this for decades. The transporter disassembles you at one end and reassembles you at the other. Is the person who appears on the planet surface the same person who stood on the transporter pad? The show never properly answered the question. Commander Riker got duplicated by a transporter malfunction once, and both Rikers just sort of got on with their lives and tried not to think about it too hard.
That's probably what we'd do too. The philosophy is unanswerable. The practicalities demand answers anyway.
Who gets the cat
Forget the grand questions about identity and democracy. The real conflict is domestic. You and your copy both love the cat. The cat, being a cat, picks one of you and ignores the other. The rejected copy stands in the kitchen watching itself be loved by its own pet, and something breaks inside it that no philosophy lecture can fix.
This is, ultimately, the problem with copying yourself. Not the legal tangles or the political chaos. The fact that everything you value about your life, your relationships, your home, your stupid cat that only sits on your lap when it wants feeding, is built for one person. Add a second you and everything halves. Your home isn't big enough. Your salary isn't enough. Your spouse doesn't have enough attention for two identical partners with identical emotional needs.
The copy would need its own life. Its own flat, its own job, its own relationships. Within a year, it's a different person who happens to share your memories of childhood. Within five years, you're strangers who look alike.
You haven't cheated the system. You've just created someone who has to start from scratch with your face and your baggage.