I found this post on The Foo Logs. Within the post there is this video, I watched it and stopped twice to just think about it. This is pretty sophisticated stuff presented in a light way.
I read the headline "Imagining the Tenth Dimension" and I thought this is about time travel or so. But it is about so much more. Watch the video - it's just mind-blowing!
The post is actually about this book: "Imagining the Tenth Dimension: A New Way of Thinking About Time and Space" from Rob Bryanton. If you believe the customer reviews on amazon.com, the book is far away from being well-written scientific literature, but nevertheless the video is great!