This is the Plane of fundamental importance for the formation of the individual. The infant from 0-3 is identified by Montessori as a “Spiritual Embryo”, as the infant has, within him/herself “potentials”, which determine his or her development, seen as empty vessels, waiting to be filled with knowledge, language, intellect and culture.
There exists within this inert being, a global power, a human creative essence, which drives her or him to form a human being, of his time, civilization and associated culture. The newborn child has to perform formative work, which corresponds in the psychological sphere, to the one just done by the embryo in the physical sphere. In this psycho-embryonic period, various powers develop separately and independently of each other i.e. arm and leg movements, sensory movements, language etc. At this stage, there is no unity in the personality. Montessori called the infant from 0-3 the “unconscious creator”.