I experienced in something called "astral traveling" years ago. I was moving through space and time, while tethered to my natural body by a silver strand of something. It was an amazing experience that affected every other facet of my life. I guess you could say that I am now aware of how transient everything is. It is hard to define what I saw and experienced at the time, and I do not know what caused me to experience it. A knowledgeable friend told me that it was called "astral traveling" years later when I described it to him.