Cut two squares of yellow cellophane. Tape each square over one end of each roll tube. Cut the colored paper into rectangles to fit around the tubes.
Paint the end of the cork black. Now cut a piece of paper in the same color to fit around the cork. Paint black lines around this piece of paper, to represent the winder mechanism of real binoculars.
Roll this paper around each tube neatly. Stick a circle of black tape around the cellophane end of each tube.
Align both tubes together precisely and place a rubber band around both of the tubes to keep in place. Then insert the cork in the valley join of the two roll tubes.
Poke two holes through the side ends of the back of the binoculars. Thread through one end of the string or cord and tie a knot to keep it intact. Do the same for the other side, completing the loop. Done!