It consists of all large hexagons. At the center it's a regular twist. That's surrounded by triangle twists.
Then for the next ring there are more large hexagons, but they are folded on the opposite side of the paper.
They are also folded in on themselves. A common technique. You just squeeze the corners together and flatten.
Then you go back to the other side of the paper again and regular hexes for the next repetition.
Repeat as often as you can depending on the size of your grid and your overall patience. I used a 32 pleat grid which yielded three rings.
It's a simple idea that yields an elegant result.
I really like it. Kudos to whoever first came up with it.