sentences:  Chalmers argues that this means that Cartesian dualism is not necessarily as problematic of a philosophical view as is commonly supposed, though he does not endorse it.Similarly, Vincent Conitzer has used the following computer simulation scenarios to illuminate further facts—facts that do not follow logically from the physical facts—about qualia (what it is "like" to have specific experiences), indexicality (what time it is "now" and who "I" am), and personal identity.Imagine a person in the real world who is observing a simulated world on a screen, from the perspective of one of the simulated agents in it.