His anti-foundationalism therefore is more than just a restatement that there is no “bedrock” for knowledge—as was argued by Karl Popper and Otto Neurath, but also that there are no fundamental ontological objects, that there are no fundamental logical principles, and that there are no privileged representation systems.  All of these echo Rudolf Carnap’s famous Principles of Tolerance (Carnap 1934): tolerance with regards to ontology, to logical principles, and to representation systems in general. 