Meditation is a mat under the ass. In ancient times, it was mostly made of auspicious soft grass. The hardness and thickness are appropriate, so as to avoid the ground moisture rushing up and invading the body unconsciously by the meditator. It is said that some of them still have a faint fragrance to soothe the nerves.

In fact, the simple explanation is to weave a round straw mat with grass.

Wind and fire futon?

But this futon is the wind and fire futon of Taishang Laojun. He is the magic weapon of the day after tomorrow. It should be practiced by Daozu. It is awesome. Are all the daily necessities practiced by Daozu at that level magic weapons? It's all amazing things. But futon is used for meditation after all.