... like I'm 5 years old
Imagine being asked to set the rules for a society you will live in. You can decide how people are treated, what freedoms they have, and what happens when someone needs help. There is one catch: you do not know who you will be in that society. You might be wealthy or poor, powerful or overlooked. The veil of ignorance is the name for this imagined limit on what you know about yourself. Its purpose is to help you judge rules without designing them to favor your own position.
The philosopher John Rawls used this idea in his 1971 book A Theory of Justice. He was not proposing that people could literally forget their lives. He was asking what principles we would choose if we could not count on being among the fortunate. That question might change how we think about access to education, protection under the law, or support when circumstances go badly.
The exercise does not tell you that every person must have exactly the same income or the same life. It asks you to look past the advantages you already hold and consider whether the rules would still seem fair if you had been dealt a different hand.
It is like agreeing on how to divide a cake before you know which slice will be yours.
... like I'm in College
Rawls calls the imagined decision-making setting the original position. People in it must choose principles for society’s major institutions, but the veil hides their own social standing, abilities, beliefs, and plans for life. They are not ignorant of everything: they can still use general knowledge about how people and societies work. They simply cannot tailor the rules to their particular circumstances. The Stanford Encyclopedia of Philosophy’s explanation of the original position sets out this distinction.
Suppose the group is considering a school system. Someone who knows they will be born into a well-resourced family might accept a system that gives those families every advantage. Behind the veil, that person cannot be sure where they will start. They have reason to ask whether a child without those resources could still have a fair opportunity.
Rawls argued that people choosing this way would protect equal basic liberties and fair equality of opportunity. He also argued that social and economic inequalities should benefit those who are least advantaged. That last claim does not forbid every difference in earnings. It asks whether an arrangement that rewards some people more also improves the position of people who have the least.
This differs from simply seeking the greatest overall benefit. A society could produce a high average while leaving a smaller group badly off. Rawls wanted us to take that group’s situation seriously rather than lose it in the average—a useful contrast with utilitarianism.
Picture a table covered with Lego bricks. Before anyone builds, you and several other adults must agree on the rules for a shared project. Who gets access to the bricks? Can someone claim the strongest baseplate? What happens if a builder has fewer pieces to start with? You know how the bricks connect, but you do not know which builder you will be when construction begins.
With that uncertainty, you might want every builder to have room to work and a chance to use the essential pieces. You might allow someone with a clever design to use extra bricks, especially if it helps the group build a sturdier model. But you would look closely at a rule that lets one person take nearly everything while another cannot get started. That is the veil’s central move: decide on the framework before learning where you personally will stand within it.
Now lift the veil. The builders will make different choices, and their creations need not look alike. Fair starting rules do not guarantee identical results. They also do not settle every disagreement about what fairness requires. They give the group a way to ask whether its shared rules can be defended to someone who did not know, in advance, which pile of bricks would be theirs.
If the Lego project sounds like a question about following rules rather than just admiring the finished model, that is a helpful instinct. Deontology explores another way philosophers think about the moral importance of principles, though Rawls’s particular concern here is the fairness of society’s institutions.
... like I'm an expert
The veil is an informational constraint within Rawls’s contractarian device of representation, not a prediction about how actual citizens would vote under uncertainty. It models the claim that contingencies such as class position and natural endowment should not determine the principles governing society’s basic structure. Parties retain general social knowledge and an interest in securing the conditions needed to pursue ends they cannot yet specify.
The resulting choice is constrained in ways that matter. Rawls gives equal basic liberties priority; fair equality of opportunity then constrains permissible social and economic inequalities. His difference principle evaluates those inequalities by their effect on the least advantaged, rather than by whether they maximize aggregate or average welfare. This is not a simple command to equalize holdings, nor is the argument adequately captured by saying that the parties are merely afraid to take risks.
A deeper question is whether the device can justify its own conclusions. The outcome depends partly on how the choice situation is specified: what information is withheld, what interests the parties represent, and which alternatives are compared. Rawls’s method of reflective equilibrium invites us to test the proposed principles against considered judgments and revise either where needed. The veil is therefore part of an argument about fairness, not a machine that produces an uncontestable answer.
Another challenge concerns people whose needs do not fit neatly into a measure of income or other broadly useful social goods. Questions about disability, care, and what counts as an advantage press on the theory’s scope. For a fuller account of those debates, see the Internet Encyclopedia of Philosophy’s discussion of Rawls.