He wanted to give the impression that arcs of wood were floating against the walls of the stage. So he bought 4×8 sheets of 1/4″ underlayment (about $10 each) and ripped them into 8″ strips. Then they cut them to length. They used five colors of stain to stain the fronts of each underlayment and get some texture in the design. Then they added those onto a frame made from 1x4x8 firing strips cut to length with a 1/2″ deep x 1/2″ wide Dado cut on each end.
They painted the back wall black to let it disappear.
They screwed the back boards to the walls and nailed arcs into the dado cuts (2 small nails each end). There was a center line through the form of Jeff’s design. All back boards were either centered or shifted 6″ or 12″ up or down. Across the stage the form was symmetrical left to right, but the colors were not.