Circular Definitions
This video presents the same text shown beside it, spoken and on screen. It adds nothing the text does not say.
State
A definition is circular when the definiens leans on the definiendum.
Show
"A logician is a person who does logic." Useless to anyone who lacked "logic" going in.
Watch for
Circles can be wide — two definitions defining each other fail the same way, just less visibly.