The correct answer for the question that is being presented above is this one: "wooden shutters." Instead of transparent glass windows in the Johnson Building, Wright used wooden shutters. He used an alternative like wooden shutters<span> </span>
Instead of transparent glass windows in the Johnson Building, Wright used pyrex tubes. In the "great workroom," the skylights are made with pyrex tubes. The tubes continue up where the wall would normally meet the ceiling to create windows above eye-level. This let in a nice soft light.
