Current progress in linguistic theorizing is more and more informed by cross-linguistic investigation, focusing on the concepts that are part of every language user's ontology, the network of cross-connected conceptualizations the mind uses in coping with the world. How are ontological structures reflected in intra- and cross-linguistic regularities? The volume unites contributions from Linguistics, Neuroscience, Philosophy, and Artificial Intelligence into the outline of an approach that promises to develop into a vital branch of cognitive science.