The Targum Pseudo-Jonathan on Exodus 28:17 reads the gemstones as geography. The breastplate held four rows of precious gems, answering to the four regions of the world. When Aaron stood before God, he was not merely carrying Israel. He was carrying a compass rose.
The first row set the tone. Carnelian, topaz, and carbuncle — three fire-colored stones, bearing the names of Reuben, Simeon, and Levi. The Sages read the order as meaningful. Reuben, the firstborn, stands at the east, the direction from which the sun rises. Simeon follows, then Levi, the tribe that would carry the Mishkan itself. The row that opens the breastplate is the row of beginnings.
The takeaway is cosmic. The priesthood was never a provincial institution. When the stones caught the candlelight, God was meant to see every direction of the created world lit up at once, each corner represented by a tribe, each tribe anchored by a name. The sanctuary was small. The jurisdiction it carried was not.