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 this new perspective with words, diagrams, analogies, and examples of many kinds. In doing so, he continues his life-long project of demonstrating that our objective, everyday thinking is the lowest rung of a ladder that reaches up to literally infinite heights. Translated into English [from GA 324a
-- The relationship between geometric studies and developing direct perception of spiritual realities
-- Constructing a fourth-dimensional hypercube
-- Creating dimensions through movement
-- Six dimensions of the self-aware human being
-- The relationship of the Trinity and the angelic hierarchies to physical space