this is my first wink to you.

”(…) Consider, he says, two boys rapidly contracting the eyelids of their right eyes. In one, this is an involuntary twitch; in the other, a conspiratorial signal to a friend. The two movements are, as movements, identical; from an I-am-a-camera, “phenomenalistic” observation of them alone, one could not tell which was twitch and which was wink. Yet the difference, however unphotographable, between a twitch and a wink is vast; as anyone unfortunate enough to have had the first taken for the second knows. The winker is communicating, and indeed communicating in a quite precise and special way: (1) deliberately, (2) to someone in particular, (3) to impart a particular message, (4) according to a socially established code, and (5) without cognizance of the rest of the company. As Ryle points out, the winker has done two things, contracted his eyelids and winked, while the twitcher has done only one, contracted his eyelids. Contracting your eyelids, when there exists a public code in which so doing counts as a conspiratorial signal is winking. That’s all there is to it: a speck of behavior, a fleck of culture, and— voila!— a gesture.” Clifford Geertz, (1973) The Interpretation of Cultures.