 Evidential ambiguity would virtually disappear if it became clear that there is no plausible means of producing some R independent of deliberate intent. Part of the persuasiveness of (6) historically came from absence of any known plausible non-intentional alternative causal account of the traditional Rs. Such cases are often linked to alleged gaps in nature—phenomena for which, it is claimed, there can be no purely natural explanation, there being a gap between nature’s production capabilities and the phenomenon in question. (For example, nature’s unaided capabilities fall short of those capabilities required for producing a radio. Thus, when we see a radio we know that something else—human agency—was involved in its production.) Design cases resting upon nature’s alleged inability to produce some relevant ‘natural’ phenomenon are generally assumed to explicitly or implicitly appeal to supernatural agency, and are typically described as “God-of-the-gaps” arguments—a description usually intended to be pejorative.