The original model whose nature determines how things are formed. In Plato the forms are at least sometimes archetypes. In many seventeenth-century philosophers, including Descartes and Locke, archetypes are the patterns or properties of things of which resemblances are formed in the mind, either by perception or by thought. In Berkeley and Malebranche, archetypes become the original ideas in the mind of God, replicated in our own minds. According to Jung the collective unconscious contains archetypal images and symbols, ready to manifest themselves in one form or another, for instance in dreams. An ectype is the impression or copy of an archetype.