It took me quite some time to figure out how to carry a scale factor with me from the outer tribar to the inner. I will talk about this below the image.
You can travel infinitely in any direction by walking through this figure.
As it was drawn with an equal distance between all vanishing points, as I have been doing for a while now, some interesting geometrical things happened. I tried to find where on the outer tribar the inner should be anchored, and while plotting several inner tribars I tried to figure out some kind of relationship.
What I finally found was that the intersections of the lines for the outside of the inner tribars all lined up on a circle. To my surprise this circle had the exact same size as a circle crossing through all vanishing points, and it would intersect the center of the tribars which was what I looked for. It also crossed through the absolute center of the vanishing points! Phew!