Your suggestion brought to mind the various Earth sandwiches - https://www.bbc.com/news/world-asia-51171834 https://www.bbc.com/news/world-asia-51171834 . Or t

Your suggestion brought to mind the various Earth sandwiches - https://www.bbc.com/news/world-asia-51171834 https://www.bbc.com/news/world-asia-51171834 . Or the "Four Corners Project" from 1976, to place corners on 4 points of land to form a tetrahedron - https://www.youtube.com/watch?v=-juK0PTbAiI https://www.youtube.com/watch?v=-juK0PTbAiI .