[Randex]How to teach your child: A necessary order to knowledge

[O-Land News Junkie]

The first concepts formed by a child are those formed directly from perceptual data; they are what philosopher Ayn Rand, the first philosopher to fully identify the hierarchical nature of knowledge, called “first-level concepts.”

http://randex.org/index.php/weblog/how_to_...r_to_knowledge/