All 5 Uses

illustrate
in
The Tipping Point
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Perhaps no one has done more to illustrate the potential of this kind of stickiness engineering, however, than children's educational television, in particular the creators of Sesame Street and, later, the show it inspired, Blue's Clues.
Chpt 3 *

illustrate = help make clear
The teen smoking epidemic does not simply illustrate the Law of the Few. however.
Chpt 7
It is also a very good illustration of the Stickiness Factor.
Chpt 7

illustration = something that helps clarify or demonstrate
The creators of Sesame Street accomplished something extraordinary, and the story of how they did that is a marvelous illustration of the second of the rules of the Tipping Point, the Stickiness Factor.†
Chpt 3
The experiences of Paul Revere and Sesame Street and crime in New York City and Gore Associates each illustrate one of the rules of Tipping Points.†
Chpt 6

Definitions:

(1) (illustrate as in: as illustrated by this example)
to help make clear -- typically by example
(2) (illustrate as in: an illustrated children's book)
to draw pictures (or provide photographs) to accompany a book or other writing
(3) (meaning too rare to warrant focus)