At least according this remarkable article from the New York Times.
Researchers at the University of Aberdeen found that when people were asked to engage in a bit of mental time travel, and to recall past events or imagine future ones, participantsâ€™ bodies subliminally acted out the metaphors embedded in how we commonly conceptualized the flow of time.
As they thought about years gone by, participants leaned slightly backward, while in fantasizing about the future, they listed to the fore. The deviations were not exactly Tower of Pisa leanings, amounting to some two or three millimetersâ€™ shift one way or the other. Nevertheless, the directionality was clear and consistent.
H/T Sydney Martin.