The balls seem to be the best choice. However, the nails are more comfortable!
This has everything to do with pressure. Your body touches the surface in certain places. The smaller the surface area of all those places together, the greater the pressure you feel. So: if you lie on, say, 10 nails, you feel a lot of pressure. But there are 2349 nails in this bed, as opposed to 147 balls. Therefore, your weight is spread out over a larger area. This way, the pressure is less and you sleep better. Zzzzzzz…
Pressure of syringes
Syringe needles have a very small surface area. Thanks to the great pressure they exert, they pierce your skin effortlessly.
Pressure of elephants
An African elephant can weigh up to 6000 kilograms! Yet they don’t sink into soft ground. This is because they spread their weight over the large surface of their four sturdy legs.
