Advances in electronics may one day enable flat panel displays that are completely transparent, like a window. In his Perspective, Wager describes recent reports of transparent transistors. He highlights the report by Nomura et al., whose transparent transistor shows unusually high mobility. This property is desirable for many applications. Although the methodology used by the authors is likely to be too expensive for practical applications, the work proves the possibility of realizing transparent transistors with very large mobilities.