Leonardo da Vinci's passion was to know how the world works, down to the muscles beneath human lips that allow us to smile. (visualize the Mona Lisa) Without formal education, da Vinci relied on experiments and experience. For example, when studying the dynamics of flow, he first observed the motion of water in pipes and rivers; sketched to activate his intuitive process; and then built a physical model as a final test. He disregarded prevailing theory. In this way, da Vinci made incredible scientific discoveries that were only fully realized centuries later.
da Vinci's process is critical for speakers. Our world is filled with copies and out of date rules. Do you really need PowerPoint for your presentations? Must you observe formalities when opening or introducing someone? Is there only one way to do a finals' presentation-- starting with the company history, and then a succession of speakers? No to all of the above.
Always consider your audience and intention. Do something unexpected like inserting a white board or flip chart. Engage the audience with questions or break-out exercises. Include your perspective or experience and don't be afraid of showing emotion. Disregard the norm and find your own way. Create your own masterpiece.