Recursion
This video presents the same text shown beside it, spoken and on screen. It adds nothing the text does not say.
State
Recursion is a problem-solving technique where a process calls itself to solve smaller instances of the same problem, shrinking the case at every call.
Show
Opening a set of nested dolls repeats one move on an ever-smaller doll until the solid one appears.
Watch for
The shrinking is mandatory, not decorative.