Thanks for introducing me to string theory, I've heard it before and like the concept of matter being a vibration. I think of matter as a weaving of two paradoxical forces that not only produce the effects of time and space, but all the physical properties we experience. In short matter is a space time oscillation, an effect that dips below the line of perceptible existance. For eg; there are elements that appear and disappear from the stage of perceptability, and the atom itself (or its components) has illusive characteristics.