everything about science, including relativity, is all about how we measure things. how our surroundings affect us. in other words, our knowledge is based upon how we perceive things. this can be different from how things actually are, and in my opinion, i think it probably is different from how things actually are. while our perception of the universe is of interest to me, not nearly so much as what the universe actually is. the frustrating part of this for me, is that i do not think it is knowable for us. we are stuck in the black box of our perception. for example, if you take a surface area of a sphere (at any radius), and imagine 2-dimensional beings living on it, they have no way of knowing that they are part of a sphere, with an actual center to it. whereas we could view the sphere in its entirety, and know exactly what it is. i have often wondered if that same analogy is at work in our universe. in other words, is our universe part of a greater dimensional thing ?