function update(value) {
                  position += 0.2 * sign;
                  color = value;
  
                  object.translation.y = position;
                  material.diffuseColor = new SFColor(1,color,color);
  
                  if (position > 7) sign = -1; 
                  if (position < -9) sign = 1; 
                  }
                  "
          }#<l++>