 The position that there are gaps in nature is not inherently irrational—and would seem to be a legitimate empirical question. But although gaps would profoundly strengthen design arguments, they have their own suite of difficulties. Gaps are usually easy to spot in cases of artifactuality, but although they may be present in nature, establishing their existence there can usually be done (by science, at least) only indirectly—via probability considerations, purported limitations on nature’s abilities, etc.