Human beings have a very strong drive to know and understand the world and their place in it. This chapter looks at a few interesting and significant views that tend not to fit as easily into these categories. Mysteries and illusions may have some things in common, but they are quite different phenomena. On the one hand, they both seem to imply that there is some sort of underlying reality that does not readily present itself to us. On the other hand, there are important differences. An illusion need not be mysterious at all. With this view, as with mysterianism, there is not a theoretical “solution” if by that we mean a resolution in favor of full-fledged freedom and responsibility. But unlike mysterianism, illusionism does suggest a practical solution. Revisionism claims to solve the problem of free will in a different way.