Have you ever visualized a universe in 4 physical dimensions? Don’t take "time" as a dimension by now, and let’s concentrate on something physical. I would say that for the average human imagination 4 dimensions are too many.
Maybe it could help to imagine a rational entity in a two-dimensional world that faces for the first time another entity from a three-dimensional world; take a look to the following interesting video from the discussed film "What the bleep do we know":

In this video, something like a 2d pacman meets a 3d person. It is interesting to notice how the pacman does not have any possibility to see the 3d person, and how the person could see and access everything in the world of pacman.

Now… how could a person from an imaginary 4th spatial dimension interact with our world? Could more dimensions solve the problems that the old physics theory does not understand? Is the universe in 10, 11, or 26 dimensions like it is suggested in the strings theory?

Another interesting point would be a discussion about the spacetime: the three spacial dimensions are strictly coupled with time, as strictly that the spacial and timing dimensions can interact each other. This is also something out of the normal human experience that opens the door to many other thoughts.

Reality can be much more complex than what we can experience. Many thousand of years ago our predecessors have seen lightnings in the skies, and though that it was a sign of a divinity being hungry with them. We shouldn’t do the same errors, and keep our mind open to new truths.

Anybody willing to go beyond Einstein, maybe through quantum mechanics?