The authors most likely use the examples in lines 1-10 of the passage ("Piaget's...knowledge") to highlight the

Piaget's theory of cognitive development is a
comprehensive theory about the nature and
development of human intelligence. It was first
developed by the Swiss clinical psychologist Jean
Piaget, who lived from 1896 to 1980. It is primarily
known as a theory of the stages of human
development. Beyond this primary purpose, it alsc
deals with the nature of knowledge itself and how
humans come gradually to acquire, construct, and
use knowledge.