classes: lecturer. I think you should add drawings to your slides, or at least during the lecture, you should leave the chair and draw on the board for students to visualize. curriculum. I think you should add drawings to your slides, or at least during the lecture, you should leave the chair and draw on the board for students to visualize. facility. I think you should add drawings to your slides, or at least during the lecture, you should leave the chair and draw on the board for students to visualize. general. I think you should add drawings to your slides, or at least during the lecture, you should leave the chair and draw on the board for students to visualize.