The prolific nature of his work and his early death has made it known as "the Mozart of psychology" (characterization created by Stephen Toulmin). The fundamental idea of his work is that human development can only be explained in terms of social interaction. The development is the internalization of cultural tools (like language) that do not initially belong to us, but belong to the human group in which we are born. These humans give us these cultural products through social interaction. The "Other", then, takes a leading role in the theory of Vygotsky.
