 Support for this idea comes from evidence that people with damage to their ventral processing often have difficulty deciphering the content of a picture without corresponding difficulty in perceiving the ordinary properties of the surface of the picture (Turnbull, Driver, &amp; McCarthy 2004). This illustrates another way that the investigation of mechanisms may further aesthetic inquiry. An aesthetic phenomenon—in this case twofoldness—is postulated and the question arises as to whether there is a plausible story about how this is implemented. If no such story were available, doubt would be thrown on the claim.