 The above list is not meant to be exhaustive or especially clean. Temporal asymmetries are everywhere. We age and die. Punchlines are at the ends of jokes. Propensities and dispositions and reproductive fitness are all future-directed. We prefer rags-to-riches stories to riches-to-rags stories. Obviously there are connections amongst many of these arrows. Some authors have explicitly or implicitly proposed various “dependency charts” that are supposed to explain which of the above arrows depend on which for their existence. Horwich (1987) argues for an explanatory relationship wherein the counterfactual arrow depends on the causal arrow, which depends on the arrow of explanation, which depends on the epistemological arrow. Lewis (1979), by contrast, thinks an alleged over-determination of traces grounds the asymmetry of counterfactuals and that this in turn grounds the rest. Suhler and Callender (2011) ground the psychological arrow on the causal and knowledge asymmetries. The chart one judges most appropriate will depend, to a large degree, upon one’s general philosophical stance on many large topics.