In an extension of the objection to equating action in humans and nonhumans, Harry Collins and Martin Kusch ( 1998 ) developed an insightful analysis that distinguishes between polimorphic and mimeomorphic actions. Polimorphic actions can look differently in different instances and yet be the same action; mimeomorphic actions look alike whenever they occur. Insulting someone can take many forms and not always look like the same action even though it is, since it can be done with different words or even without words. Stirring the pot is an action that looks pretty much the same whenever it takes place. On their argument, humans can perform both kinds of actions, but machines or artifacts only the second.