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Seattle. Material: Two sheets 4' x 8' x 3/4" standard finished plywood. Cut sheets in half - 4 sheets 4' x 4' x 3/4" PROCEDURE: 1 Upright first sheet, placing perpendicular to wall. 2. Align sheets 2# & 3# on vertical, edge - juxtaposed 3. Place sheet 4# at Rt [[angle symbol]] to sheet three, 4" down from top edge and centered - weight will extend through sheet 1,2,3 holding them upright in line and forcing #1 to wall. [[image - diagram of four square boxes and annotated 1 2 3 4 Wall Floor [[right arrow]] 4" down top edge centered at rt [[angle symbol]] ]] R. Serra 1969