When bees draw comb, they actually start off by making the cells round.
They're somewhat like what a single soap bubble looks like. Round.
A soap bubble will stay round until it touches another soap bubble. The bubbles latch onto each other, sliding together. The round sides turn into flat sides--six sides--a hexagon.
They warm them to between 37 and 40 degrees Celsius.
Once warmed the tension of the adjacent cell walls, cause the cell walls to shift into a six sided hexagon shape.
Why is this structure so amazing that people copy it in design and architecture?
This information was discovered in the amazing book: The Buzz About Bees written by Jurgen Tautz that's available on Amazon.