"This volume -- the fifteenth in the Nova Scotia Series -- presents the work by Michael Asher from 1969 to 1979 and the descriptions and commentaries on this work that were written by Michael Asher for this book from 1973 (with my collaboration from 1978) to 1983. It is an attempt on the side of the author and the editor to make accessible to readers and viewers the documents of an artistic practice that one could characterize as being both extremely ephemeral and transient and that is -- in the view of the editor -- at the same time among the most concrete and materialist aesthetic productions of the Sixties and Seventies..." -- Benjamin H.D. Buchloh from book's editor note.