What is the nature of reality? What does is mean to be real? What is the limit of our knowledge? Perception is the key, but it can fool you. Understanding the foundation of our knowledge is the first step to understanding reality.

Albert Einstein once wrote, "People like us who believe in physics know that the distinction between past, present and future is only a stubbornly persistent illusion." Time, in other words, he said, is an illusion. Many physicists since have shared this view, that true reality is timeless.