Garr Reynolds has a unique perspective on design and presentation graphics. In the last two posts on his Presentation Zen blog he discussed 7 Japanese aesthetic principles to change your thinking and 10 design lessons from the art of ikebana.
Those posts reminded me that you can also see design in bonsai, those artfully pruned miniature trees or shrubs with their own aesthetic rules. Contrast the two bonsai shown above. The top one is upright and balanced, very different from the bottom one.
Both are in the Pacific Rim Bonsai Collection, which is located at the Weyerhaeuser corporate campus near Federal Way, Washington. Currently the collection is not open to the public, but you can read more about the top tree in their photo gallery.
If your mind map for a speech topic looks more like the bottom photo than the top, perhaps you should think further before you inflict it on an audience.