The worlds of marble and wood left me feeling stranded halfway through a long tunnel. Trying to grasp the concepts of higher dimensions left me feeling more like a coy out of water than one still trapped in the pond. The concepts discussed in "Part 1: Entering the Fifth Dimension,"" in Hyperspace, by Michio Kaku, left me with more questions than answers. The history and theories found in Introducing Quantum Theoy, by J. P. ...