 These ideas can be made more perspicuous by some pictures, which suggest additional refinements and extensions. Figure 2 below illustrates the voting game. In graph 2(a), twenty five supporters are choosing whether to vote in a majority-rule election. Utility to a player i is plotted against the number of those other than i who vote. Dark disks represent cooperators (voters) and circles represent defectors (non-voters). When the number of other voters is fewer than twelve or greater than twelve then defection beats cooperation. But when exactly twelve others vote it benefits i to vote. 