A building whose position is totally unknown would be placed in the largest voxel; this being the root node that represents the entire world. Image Understanding in Unstructured Environment By Su-shing Chen, 1988
This is meaningful to me. Let’s take this out of its original context.
a) you have the Universe.
b) There’s a thing.
1) What is that thing? Who knows WHAT it is? It’s a thing.
2) Where is that thing? Who knows WHERE it is, just that it belongs with the Universe.
3) When is that thing? Who knows WHEN it is, just that it belongs with Universe.
4) Why does that thing belong to the Universe? Because we said it did.
5) Who said that thing belongs with the Universe?
Now THAT’S something we can answer