 Those who take this view have to respond to Evans’s original argument, about which there has been intense debate (see separate article on vagueness, Edgington 2000, Lewis 1988, Parsons 2000, van Inwagen 1990, Williamson 2002 and 2003), but also to more recent variants. There is no space to go into these matters here, but one particular variant of the Evans argument worth briefly noting is given by Hawley (2001). Alpha and Omega are (two?) people, the first of whom steps into van Inwagen’s (1990) fiendish cabinet which disrupts whatever features are relevant to personal identity, and the second of whom then steps out: