Geometry, Relativity, and the Fourth DimensionThis is a highly readable, popular exposition of the fourth dimension and the structure of the universe. A remarkable pictorial discussion of the curved spacetime we call home, it achieves even greater impact through the use of 141 excellent illustrations. This is the first sustained visual account of many important topics in relativity theory that up till now have only been treated separately. 
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Review: Geometry, Relativity and the Fourth Dimension
User Review  Thom Foolery  GoodreadsWeird, wonderful, and at times over my head (when the equations came out, my eyes glazed over—and I survived two attempts at college calculus) exploration of the universe as a single geometric object ... Read full review
Review: Geometry, Relativity and the Fourth Dimension
User Review  Mary Tierney  GoodreadsVery clear , easily understood by people without mathematical training Read full review
Contents
The Fourth Dimension  1 
NonEuclidean Geometry  17 
Curved Space  36 
Time as a Higher Dimension  57 
Special Relativity  68 
Time Travel  92 
The Shape of SpaceTime  100 
Conclusion  117 
Annotated Bibliography  119 