This is because the calculation of centre-of-mass velocity of an expanding universe presupposes some notion of simultaneity in order to determine the velocity of distant galaxies. Other examples of Pokies - Double Shot symmetry breaking are well known in physics, such as the Weinberg-Salaam theory of the electromagnetic and weak interactions. Under the contingent actualising hypothesis being proposed, one detection event will become definite before the other for reasons to do perhaps with potentiality distributions. We do not however specify those actual orders in advance, and cannot, because they depend, we now postulate, on details which only come to be depth-sorting once those events have definitely happened. The initial state of the system is clearly symmetric under rotations about the vertical axis, and there is no predetermined direction for the ball to move, because gravity acts only in the vertical Although there is no predetermined direction for the ball at the top to fall, it is in an unstable depth-sorting and will eventually fall in some defi- nite direction. General Relativity Pokies - Werewolf Wild an example of a theory which allows for the essential arbitrariness of coordinate systems, and allows any curvilinear depth-sorting of coordinates to be used to formulate the theory. Yet, the initial state is unstable, depth-sorting the ball will eventually fall in one direction or another depth-sorting . Similar kinds of Principles have been invoked to explain the direction of time, if the laws of physics themselves do not specify any direction (see eg Cramer ). The fourth option uses some contingent properties of the depth-sorting natural processes (as they proceed) to give rise to their actual sequence. Then, as we shall see in the depth-sorting case, Pokies - Pyramid Pays has actually happened in the past propagates its effects to infiuence present symmetry breaking. The laws of physics are symmetric and invariant with respect to changes of velocity and position of coordinate frames, but this symmetry is broken once actual events start occurring. Furthermore, if we did know of a basis to select one such set, this would seem to be counter to the theory of relativity, which requires that all laws of nature must be invariant with respect to changes of velocity and position. After spontaneous symmetry breaking, symmetric laws are broken by the requirement that something actually happens. direction.