 Veldman (forthcoming) discusses several points of (dis)agreement between Brouwer and Wittgenstein, such as the danger of logic, which, according to both, may lead to constructions without mathematical content. One of the disagreements raised in the paper concerns Wittgenstein’s view that mathematics is a common undertaking, which is in stark contrast to Brouwer’s Creating Subject and his view that mathematics is a languageless activity. 