All through the 1970s Antonakos produced his conceptual Packages. Filled, sealed, and sent to individuals or groups of friends, they were meant either never to be opened, to be opened on a specific date, or to be opened after the death of the artist. There were approximately thirty projects. An important set sent in 1974 and 1975 to Richard Artschwager, Daniel Buren, Sol LeWitt, and Robert Ryman to be filled by them was opened twenty-five years later as the central event during the major exhibition Time Boxes 2000 at the Brandeis's Rose Art Museum. Less concerned with their contents than with our consciousness through time of not knowing, they relate to such concepts as "incomplete circle" -- knowing what/that we do not know/see. The Greek art historian Savvas Michael has written: "The material of the Packages is time."