3. Some Ideas a. Balance and Layers Imagine a world of rubberized sheets layered upon each other. On any one sheet there are attractions and repulsions, tensions in various directions, so that at each point there is a balance of forces if there is some sort of equilibrium, or if there are changing forces there is ongoing stretching and compression trying to keep up with the changes. Since the speed of sound is quite finite, it is quite likely that the ongoing stretching and compression may lag behind the changes. Moreover adjacent layers are connected to each other, so that adjustments in one layer will affect the layers above and below it. Now the layers might be notional, for example on one layer are the masses and energies of matter, and on the other is the rulers that measure the distance between points, both in space and time. Such is the account of gravity provided by general relativity, a measure of the mass energy is on one such layer, and a measure of the spa...