Doesn't everyone do this? I remember at the age of five finally learning to control my falling dreams at night, to be able to freeze in the air and eventually fly (the Matrix scene definitely resonated later). This was the beginning of a continuous exercise of imagining things more and more exactly and controlling that imagination. Now as an engineer, I spend most of my time staring at a wall simulating and refining designs in my head. As Tesla notes, they are usually accurate. The most interesting cases however are when I can't quite be sure what will happen. Building those projects are some of the most exciting and often most valuable work. Besides imagination, simulating on a computer is useful, but more to explain an imagined design to others. Occassionaly, when simulations scale to a certain level of parallel interaction (like neural networks), those simulations take on the character of reality which may defy imagination. At least until enough experimentation and observation develops intuition.