Book has opposite spiral spines so that pages interleave.Peter H. Barnett: Reciprocal Encoding-Decoding Construction (hand drawn numbered limited edition, 1981-1983) is made of two spiral-bound sketch pads bonded together and cut down to 14" square. The result is a book with bindings on either side and a stiffened middle. There are 12 pages attached to each binding. The principal graphic element, which supports the textual elements, is a sequence of triangular cutouts within circles. The cut-out pages mesh together on either side of the core, and texts written across the edges of the cutouts become legible in sequence as the pages are meshed. As the pages mesh and the designs and texts on one side of the book become legible, the designs and texts on the other side are decomposed. The meshing and unmeshing of pages by the interactive reader, together with the composition and decomposition of design and text, articulates the title Reciprocal Encoding Decoding Construction , simultaneous mutual communication wherein the encoding of my message to you is the decoding your message to me. -- Source of annotation: Marvin or Ruth Sackner.