We refer to sensitive periods as psychological characteristics more-so than sensitive periods in the 2nd and 3rd planes.
The second plane child
- is in the age of imagination;
- he has less need for concrete materials in his activity.
- He develops a herd instinct, desiring social life with others of similar development
- and he develops a sense of morality, seeking out what is right and wrong, working out the definition of fair play.
The third plane child is concerned with ethics and finding his place in the world.