Black balls and white balls in a box are shaken.

Black balls and white balls in a box are shaken. An equal number of black and white balls are placed in a box, black balls on one side, white balls on the other. Energy is added to the system by shaking the box. The original ordering of the balls disappears. If shaking is hard enough, some balls may jump out of the box, introducing a second type of irreversible chage into the system. IRREVERSIBILITY AND FLUCTUATIONS