While lying in bed this morning I thought of the spanoflife interface. Since we only have 3 dimensions to work in, I'll have to go 3d. But, what I realized is that people live their lives in 2D space. Yes, we climb mountains, go into Death Valley, etc., but for the most part we don't gain or lose much elevation, compared to the horizontal distance we cover. So I can use that dimension, height, to represent the passage of time. Each person will have a life line that stretches from the top to the bottom of the screen, and their postiion on the earth will be represented in the X,Y plane.
This is basically the same as some railroad timetables.
This will not be applicable for astronauts.
This post doesn't make much sense.