By viewing certain structures as derived from, or referring to, a mind-independent reality, traditional ontology has painted itself into a corner. As was stressed by philosopher  Karl Jaspers, consciousness/experience is encompassing. The question as to how something in the objective world can give rise to subjective experience is therefore ill-conceived; it rests on the mistaken premise that mind and body are ontically separated, and that this separation has somehow to be overcome. Herbert Müller has developed these insights into an epistemology that does not refer to an outside world and that, a fortiori, does not seek to derive knowledge from an external source. This article presents Müller’s work on “structuring with zero-derivation” (0-D), mainly in his own words, extracted from three articles that appeared in the highly commendable open-access e-journal Constructivist Foundations.