The Fourth Dimension: Sacred Geometry, Alchemy, and Mathematics

6 lectures, Berlin, March 24-June 7, 1905;
2 lectures, Nov. 7, 1905 & Oct. 22, 1908;
Questions & Answers, 1904-1922 (CW 324)

The point, line, plane and solid objects represent the first three dimensions, but a kind of reversal of space is involved in the ascent to a fourth dimension. Steiner leads us to the brink of this new perspective--as nearly as it can be done with words, diagrams, analogies, and examples of many kinds. In doing so, he continues his lifelong project of demonstrating that ...