 Even when it comes to such simple ideas as the image of a particular shade of blue, the mind seems to be more than a blank slate on which experience writes. The main question is whether the veins in Leibniz’s metaphor should count as part of the knowledge or just as part of our biological mental architecture: all the knowledge we can ever acquire is contrained by the type of beings we are. This does not require our positing that concepts be part of the inner workings, at the beginning of our lives.