A metaphor analysed from the perspective of blending theory. From this perspective metaphors involve 'frame-projection asymmetry': while both input spaces contain a distinct frame, it is only the frame from one of these inputs (the source domain in conceptual metaphor theory, the framing input in blending theory) that is projected to the blended space. Although a single scope network is the prototype for a metaphoric blend, other kinds of integration network can exhibit frame-projection asymmetry to varying degrees and thus can be considered to be metaphoric blends. Such an example is the digging your own grave blend, which is discussed in the entry for double-scope network.