In the original position, you are asked to consider which principles you would select for the basic structure of society, but you must select as if you had no knowledge ahead of time what position you would end up having in that society. This choice is made from behind a "veil of ignorance", which prevents you from knowing your ethnicity, social status, gender and, crucially, your individual idea of how to lead a good life. Ideally, this would force participants to select principles impartially and rationally.