Spacetime configuration can be muti-categorical.
Regarding the hard problem raised by Jan Verhey, let's examine a very simple case for qualia invariance in the human brain. Please note that I assume some sort of isomorphism between the neurophysiological correlate of Clinton's face and its subjective image, much like, say, the source of a web page and its actual view with a web browser. So much about materialism. I believe the hard problem is much harder that it may seem at first glance, and perhaps we should examine some new ideas about mind-matter relations. To explain this, I shall make use of an imaginary example.