The smart watch, increasingly gaining popularity, has limited input and output capabilities due to its size and thus mostly used as a surrogate device to the smart phone. In this poster, we propose “Touch Skin (TS)” that enlarges the interaction space of the smart watch using the hand (or skin) surface and proprioceptive sense. While the input interface is displayed on the small smart watch screen, the interaction is carried out by touching on the larger hand surface to which the input interface elements (e.g. graphical buttons and keys) are mapped. We hypothesize that even though the display and interaction surface are separated, the humans are nevertheless able to perform competently based on one’s proprioceptive sense. While sensing for finger touch positions on the hand/skin surface remains to be a technical hurdle, we first explore whether our hypothesis is valid through an enactment study comparing the performance the Touch Skin input to that of the nominal smart phones.