One of you asked what it really means when physicists say “spacetime is geometry,” so here we go. In physics, geometry is not about shapes on paper. It is the rulebook that tells you how to measure distance and time between events. On a flat surface, straight lines are shortest. On a curved surface, the “straightest” path can look bent from the outside. Einstein’s move was to apply that idea to the entire universe. Mass and energy do not pull on objects directly. They change the geometry of spac

Lori Vambe - Space-Time Dreamtime: The Four-Dimensional Music Of Lori Vambe

Fourth Dimension | Definition, History & Examples

What Is a Tesseract or Hypercube?

Can a tesseract exist? - TimesMojo

An amazing mechanical Tesseract: understanding 4D space locked into a 3D world...In geometry, a "tesseract" (or 4-cube) is a four-dimensional hypercube, much like how a square is to a… | Gianni Sarcone | 194 comments