Identity of indiscernibles

Identity of Indiscernibles means that no two things can be exactly the same at the same time. For example, two people can't be exactly the same in every way--they might look the same, but they have different thoughts, feelings, and experiences. This means that no two things can be exactly the same. This can be used to explain why no two snowflakes are alike, even though they might look alike--they are each unique and special in their own way!