 A version of PC may be defended if we make use of Dretske’s own notion of indirect perception (1969). Consider a scientist who studies the behavior of electrons by watching bubbles they leave behind in a cloud chamber. The electrons themselves are invisible, but the scientist can perceive that the (invisible) electrons are moving in certain ways by perceiving that the (visible) bubbles left behind are arranging themselves in specific ways. What we directly perceive positions us to perceive various things indirectly. Now assume that when we directly or indirectly perceive p, and this causes us to believe q, where p entails q, we are positioned to perceive q indirectly. Then we are well on our way to accepting some version of PC, such as, for example: