Speed of Light Barrier

Hi Cavediver.You've inspired me to purchase Nigel Caldor's Einstein's Universe to obtain a grasp of relativity. I recall you advising someone to purchase it in another thread; which, I can't remember. I hope you can give me a brief synopsis of the book, and better prepare me for concepts to come.Moreover, I'm trying to understand your analogy, but I still have some hurdles to leap. Granted, the only astronomy knowledge I have is from an introductory community college course, but I was and still have a great deal of curiousity on the subject, and who knows, perhaps take it as a major. This I don't understand. How can one move through time yet not be moving through space? Would photons be an example of this? Traveling c but not moving through space? If so, how could it not be moving through space if it has a direct effect on me? Is this how we on earth experience space-time? Or is the ruler being tilted partially in each dimension? If the ruler is tilted directly up - entirely in the time-direction- moving at velocity c identical from my earthly frame of reference to the ruler being pointed directly horizontal- moving entirely in the space-direction? In other words, are they one and the same?I may have more questions, but I have to leave for work.Thank you in advance for any help you can give.