In his book Hyperspace 
physics professor Michio Kaku 
introduces readers to phenomena that occur in ten or twenty-six dimensions. 
To prepare for this leap into higher space, he invites his audience to 
imagine the plight of a two-dimensional creature trying to understand the 
third dimension.  The Flatland analogy still works!
Prof. Kaku is the author of many works on physics and its relationship to 
other sciences, including ecology, as described on the WBAI web page for 
his weekly national
science radio show.  The 
Frequently Asked 
Questions list from that page answers a number of common questions 
about physics and higher dimensions.
Numerous other writers have provided ways of looking at the structure of 
the universe from the point of view of mathematical physics.