Writing in the New York Times, Dave Kehr called Bruce Posner’s 19-hour box set, Unseen Cinema: Early American Avant-Garde Film 1894-1941, “one of the major monuments of the DVD medium.” Yet one peculiarity of this medium is that its monuments are easily overlooked, and this 89-minute program offers a rare chance to sample Posner’s uncommon discoveries and rediscoveries on a big screen. The films in this batch will include Kinetoscopes, mutoscopes, and films by Edison Studios and American Mutoscope and Biograph Company, Fernand Leger and Dudley Murphy’s Ballet Mechanique (in a version including the original music score and some color shots), Case-Sponable Sound Tests by Theodore Case and E.I. Sponable, J.S. Watson Jr. and Alec Wilder’s Tomato Is Another Day, and Ralph Steiner’s H2O.