Kurt Lewin - Hanna trying to sit on the stone unsuccessfully

“Hannah is one year and seven months old. The stone has a positive valence in the momentary living space of the child. The child is attracted by the stone. In order to sit down, the child has to turn around, that is away from the goal. This detour to reach the goal is extremely difficult for children.“ Kurt Lewin’s video about his study on field theory quoted in Vygotsky’s article “Play and its role in the mental development of child“ (1933). Original from: