The first type of abstraction from objects I shall refer to as simple abstraction, but the second type I shall call reflective abstraction, using this term in a double sense.
-- Jean Piaget
   
Jean Piaget   Name:
Jean Piaget
Type:
Psychologist
Nationality:
Swiss
Birth:
August 9, 1896
Death:
September 16, 1980
https://www.nutquote.com/quote/Jean_Piaget