Sinistromanual

"[T]he artist, probably for the sake of symmetry, makes one right-handed and the other left-handed. The alternative, of course, is that the latter actually was a sinistromanual player of note [of the game of t'ou hu or pitch-pot] and was thus intentionally represented. In any event, we have in this relief a very early Chinese illustration of this phenomenon."

"There are other cautions to be emphasized relating to the acquirement of dextrality by the savage: Nearly all the actions which we now call right-handed were in primeval times to him unknown. […] [T]he modern gun and revolver had not been devised. The bow and arrow, the spear, boomerang, club, etc., could be used as well with the left hand by the sinistromanual."