One part of my thesis is about the anatomy of an interactive infographic. Obviously the most important feature of an interactive is the way it enables users to manipulate the visualization. Using interactive modalities like typing, clicking and dragging they can hide, reveal, add or filter information.
Or they can zoom. In 1968 Ray and Charles Eames enlightened the world with a brilliant short film that first zooms out to the edges of the universe and then zooms back in to the inside of an atom. Cary and Michael Huang did something similar in an interactive that gives you the opportunity to zoom the universe. The University of Utah used the same idea (and a much more talented designer) on this great site about genetics.