A theory is presented which proposes that knowledge acquisition involves direct perception of schematic information in the form of structural and transformational invariances. Individual components with salient verbal descriptions are considered conscious place-holders for non-conscious invariant schemes. It is speculated that theories positing mental construction have three related causes: The first is a lack of consciousness of the schema processing capacities of the right hemisphere; the second is the paucity of adequate words to express schematic relationships; and the last involves (...) the dominance of verbal processes in consciousness. Philosophical theories are reviewed and schematic data relevant to biological survival is offered. Applications to education are suggested. (shrink)