books.google.fr - Exposition of 4th dimension, concepts of relativity as Flatland characters continue adventures. Popular, easily followed yet accurate, profound. Topics include curved space time as a higher dimension, special relativity, and shape of space-time. Accessible to lay readers but also of interest to specialists....http://books.google.fr/books/about/Geometry_Relativity_and_the_Fourth_Dimen.html?hl=fr&id=IsiUudN5pD0C&q=quantum+mechanics&utm_source=gb-gplus-shareGeometry, Relativity, and the Fourth Dimension
