The aim of this paper is to investigate the relations between knowledge, language and communication within the framework of Neurath's philosophical and political program. In particular, we draw a parallel between the adoption of the physicalist language as the basic language of science and the development of ISOTYPE system of visual education. We defend the idea that they maintain a relation of reciprocity with each other that makes possible the exchange of factual information and the transformation of verbal statements into (...) visual statements, and vice versa. This relation of reciprocity is also based on a series of shared features. In this regard, we consider that both are conceived as thing-languages and both play a pedagogical and political role, that consists in enabling communication between science and society. For Neurath, this role also involves a model of communication aimed at the humanization of knowledge and the democratization of decisions. (shrink)