Presentations often begin by puzzling through a riddle. The speaker can often feel the presence of the riddle before she/he can articulate it. Sometimes it is in the articulation itself that the problem is solved. I use time and imagination to get closer to the audience. The closer I get to the audience, the clearer I can see the elements of the riddle. The moment I can articulate the riddle, I can form the essence of the answer. In the end, the speaker does not optimize the presentation, the speaker allows the audience to optimize himself.