The overarching theme of the "Metal Gear Solid" series is that of the "gene, meme, scene, sense, peace, revenge and race," and how people are affected by these factors according to the game's producer Kojima—"Metal Gear Solid" deals with genetics and the moral implications of genetic engineering, "Metal Gear Solid 2: Sons of Liberty" deals with how identity can be affected by the philosophies of one's society (a "meme") and the effects of censorship on society, "" deals with how the time and place one lives in (a "scene") affects their identity, how politics change along with the times and hyperreality, the inability to distinguish fact and fiction in an information saturated world.