We are merely shadows of the glory that is to come. The real things we see, and believe, are real everywhere and outside of our perception. There is a subtle slight of hand here. What Bertrand uses for analogy is testable experience such as decaying fruit. But what I speak of is the concept of Justice is innate in mankind.
Concepts are testable only by intelligent beings, and in their domain.
Though cultures may have different ways to mete out justice, Justice is a universal concept nevertheless. With that we have to cover the nature of universal concepts of humanity. These are things that I will say are conceptual objects. These concepts are as hard and real as the desk I lean on or the keyboard upon which i type. They exist outside and independant of human interpretation.