Second, simply use PowerPoint as a slide projector rather than an information tool.
The idea is that the content is the interface, the information is the interface, not computer-administrative debris.
A metaphor for good information design is a map. Hold any diagram against a map and see how it compares.
It is not how much empty space there is, but rather how it is used. It is not how much information there is, but rather how effectively it is arranged.
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.
There is no such thing as information overload, just bad design. If something is cluttered and/or confusing, fix your design.
Clutter is not a property of information. Clutter is a failure of design.
Science and art have in common intense seeing, the wide-eyed observing that generates empirical information.