Why is it Called an Overhead Projector? The Illuminating History of a Classroom Staple
The overhead projector, a familiar sight in classrooms and meeting rooms for decades, evokes a certain nostalgia for those who experienced its reign. Before the ubiquitous digital projector and interactive whiteboards, the overhead projector (often shortened to OHP) was the king of visual aids. Its name, however, begs a simple yet intriguing question: why is …