The target of this chapter is cultural differences in thinking. Westerners think in a linear way whereas Easterners think dialectically. Three explanations have been proposed for the cultural differences in thinking. The first is based on the framework of between individualist (in the West) and collectivist (in the East) cultures. The second is based on Chinese philosophy (Taoism, Buddhism, etc.), which is contrasted with ancient Greek philosophy. The third is based on the distinction between Westerners’ low-context culture and Easterners’ high-context culture. The third explanation can be developed to a socio-ecological theory in the sense that a low-context culture is likely to be nourished by multicultural environments. The socio-ecological explanation can be in the frame of ‘big history’ approach which describes how contemporary cultural diversity has been achieved, although it is criticized by some institutionalists.