Gentile was, because of his "actualist" system, a notable philosophical presence across Europe during his time. At its base, Gentile's brand of idealism asserted the primacy of the "pure act" of thinking. This act is foundational to all human experience – it "creates" the phenomenal world – and involves a process of "reflective awareness" (in Italian, "l'atto del pensiero, pensiero pensante") that is constitutive of the Absolute and revealed in education. Gentile's emphasis on seeing Mind as the Absolute signaled his "revival of the idealist doctrine of the autonomy of the mind." It also connected his philosophical work to his vocation as a teacher. In actual idealism, then, pedagogy is transcendental and provides the process by which the Absolute is revealed. His idea of a transcending truth above positivism garnered particular attention by emphasizing that all modes of sensation only take the form of ideas within one's mind; in other words, they are mental constructs. To Gentile, for example, even the correlation of the function and location of the physical brain with the functions of the physical body was merely a consistent creation of the mind, and not of the brain (itself a creation of the mind). Observations like this have led some commentators to view Gentile's philosophy as a kind of "absolute solipsism," expressing the idea "that only the spirit or mind is real".