I included an actual map of the neighborhood, including the house that I grew up in and the school I attended as a child.
You can see that many of the streets are not at 90 degree angled intersections, some are at around 60 or 120 degrees.
My mind, and others who experience VRIs, only map the surroundings as if on a straight line grid. So a 60 or 120 degree turn gets mentally mapped as a 90 degree one.
What this leads to is a discrepancy between what is actual and perceived.
The top portion of the drawing contains the actual map of the neighborhood.
The bottom portion of the drawing contains the four perceived worlds that are experienced as a result of the difference in mapping using a percieved grid.
The top left map on the bottom portion contains the School 1 world. House 1 was my normally perceived orientation of my house on the School 1 map. When I left my house and went along street A to street B, I perceived a 90 degree right turn, even though it was actually about a 60 degree right turn (which added 30 degrees to the actual). When I arrived at the school, it was perceived to be actually oriented exactly how it is in that diagram, relative to my house 1 position. When I walked home from school along street C to D, I perceived it to be a 90 degree right turn, even though it was actually about a 60 degree right turn (which added 30 degrees to the actual). The turns from street D to E to F to G to H were close to 90 degrees, and that's how I perceived them. The turn from street H to A was actually about 60 degrees to the right, but I perceived it as a 90 degree right turn (which added 30 degrees to the actual).
When you see that I mentally added a total of about 90 degrees from actual within my mental grid map, it explains why I arrived back home to find that it had changed 90 degrees into house 2 position, which is 90 degrees rotated from my normal house 1 position!
The School 2 map world shows how if I went to school from my normal house position 1 along streets H, G, F, E, D and C, that I would find my school in position 2, and if I came home along street B, that I would find my house had flipped to position 4, which was a really cool position to experience.
The 2 lower maps show school position 3 and 4 world maps, with the associated House positions 2, 3 and 4. They were less experienced, because there had to be an extra flip in there from my normal house position 1 maps, but they were still experienced on occasion and were also fun to visit.