- rats’ brains, and presumably ours, tessellate the plane surface we walk on with multiple overlapping triangular grids
*(is there a mathematical reason triangles are optimal? euler characteristic, perhaps?)*
- “path” neurons in the hippocampus fire as we cross these grids to reconstruct our previous paths
- “boundary” neurons in the hippocampus fire as we approach the boundaries of a space
*(what about agoramaniacs? or ancient people who hunted buffalo on the plain?)*

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