They don’t, they make them round and they naturally become haxagonal when they set since that’s the most optimal and strongest way of filling the space without collapsing.
You can see the same thing with soap bubbles on water. When lots of them get squeezed together on the surface the ones toward the middle become hexagonal.
Voronoi Relaxation / Lloyd’s algorithm (keyword to search on YouTube).
Explanation:
Imagine you are a bee and you are making a cell by putting wax around you. An other bee on the other side of the wall is also doing the same, and you are kind of pushing against both sides of the wall at the same time. The wall is made of wax and is malleable so you can squish it to make your cell bigger.
What happens if you are in a smaller cell than your neighbor? You can push against the walls around you more easily, and you have more strength than the opposite bee. So it naturally make the cell the same size.
But it also have an other effect, if you push in a corner, two bee push against you, so it pushes you away from that corner. In general, if you look at the bees when they are in the cells, they are in the center of those cells and pushing against all the walls in such a way that the area in each cell is the same as the neighboring cells. Cells with a tiny wall between them don’t push each other much, and will get closer to each other, increasing the common wall size. So it pushes all cells to have all walls the same size.
It turns out if you simulate this, you get a pretty interesting result: in a rectangle, the cells in the corner will become square, the cells in an edge will become pentagons and the cells in the middle will become hexagons. All will have the same area and because most of the cells are not in a corner or an edge, they are almost all hexagons.
Keeping it simple, it’s actually because they make a bunch of round shapes but when you pack round things together they pack into the lowest energy state which is a hexagon on a 2d plane.
Fun fact though that other comments have missed though. Bee honeycombs aren’t actually Hexagons, they are Rhombic Dodecahedrons, a remarkably stable 12 sides shape that looks like a hexagon when cut in half. It is the shape that spheres fall into when pressed together. It’s my favorite shape also.
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