Imagine designing the basic rules of a society without knowing where you will land in it. You might be wealthy or poor, healthy or ill, well connected or excluded. What protections would you insist on before the veil lifts?
John Rawls called this a way to reason from an original position. It is a thought experiment, not a prediction that everyone will agree. Its strength is that it makes our private advantages harder to treat as the natural measure of fairness.
The exercise can be applied to housing, education, healthcare, and the digital systems that distribute opportunity. It does not deliver a policy by itself. It offers a demanding question: could you accept the rule if you did not know which side of it you would occupy?