Although the colophon states this book was supposed to be a signed and number edition of 49 copies and part of a series that included Qua Trains, Art, Toxic, and Ocean among others, it is neither signed nor numbered and is not referred to by the other books of this series nor in Wally Depew's personal list. Therefore, the two copies held by the Sackner Archive with different colored covers, purple and beige, are probably unique. The book has no text except for the colophon and depicts different placements of black woodblock squares on the page that provide a moving image while the pages are flipped. -- Source of annotation: Marvin or Ruth Sackner.