Ana and Kata: “Summerland” by Hannu Rajaniemi
“Yet the longer you lived in Summerland, the stranger things became. Your hypersight grew more acute, and little by little, you developed an awareness of two additional directions that were invisible to the living. One was the ana direction, four-up. Towards ana lay the world of the living, in its own thin slice of the aether. It was the direction of the Unseen, the mysterious source of hyperlight and soul. Luz stones fell from ana, lodged themselves in dense aetheric configurations like brains at birth. Upon death, the luz detached and fell below the plane of the living world in the kata direction – the equivalent of down in the fourth [spatial] dimension.”
In “Summerland” by Hannu Rajaniemi
I don’t know how much physics people reading this post know. So, here’s a very, very, very brief synopsis on how objects in 1D, 2D, 3D, 4D space move:
Dimensional space Movement that can be made in that space
1D -> Forward, backward
2D -> Forward, backward, right, left
3D -> Forward, backward, right, left, up, down
4D -> Forward, backward, right, left, up, down, ana (imagine the object coming down from heaven), kata (imagine the object going up from hell)
As you can see, in 4D space we’ve got two additional directions: ana and kata. If want more than this by way of explanation, you’ve got to look elsewhere.
If you're into stuff like this, you can read the full review.