> Granite flats can be used as mounting surfaces for machines that need to stay very accurately aligned. Dozens of these huge precision granite blocks were sold as scrap to a local stone dealer, and I happened to pull up in their lot just after they had unloaded them. Blocks were piled up everywhere, blocking the driveway and generally making a nuisance of themselves, so the owner offered to sell me a bunch cheap just to get them out of his hair. I was told that the two mounting surfaces on each block are flat and parallel within millionths of an inch. This could be true, and if it is you’re looking at some of the most expensive lawn furniture in the world. I rented a rough-terrain forklift to arranged them in my front yard. There they remain to this day, 25 years later. 25 million years from now they will probably still be there, buried under the debris of a thousand civilizations come and gone. [1]
Not to be a debbie downer but there's zero order to this "periodic" table. If there were, the granite plates would be somewhere in the first couple of rows as the foundation to the industrial revolution. We wouldn't have had precision manufacturing or 95% of the modern tools on that table without them. Building them was the first time humans figured out how to make perfect flat surfaces without which our world wouldn't be possible.
(Also, I would name gauge blocks over granite flats as fundamental to precision, but in any case, all measuring tools are in the same row because they are related, just as are the lanthanides and actinides.) They are at the bottom because that's where they fit most naturally. My logic they should be the noble gasses, because they don't change anything. But there were too many I wanted to include. It was anodizing having to move them to a larger space.