Clutter and confusion are failures of design, not attributes of information.
Clutter is not an attribute of information, clutter is a failure of design...fix the design rather than stripping all the detail out of the map.
Audience boredom is usually a content failure, not a decoration failure.
PowerPoint presentations too often resemble a school play - very loud, very slow, and very simple.
A practical part of my teaching is to provide demonstrative, hands-on experiences.
The speculative part of my work is that these particular cognitive tasks - ways of thinking analytically - are tied to nature's laws.