why is lying on sand at the beach comfortable, while a few grains of sand in a bed are irritating?

Question

why is lying on sand at the beach comfortable, while a few grains of sand in a bed are irritating?

In: Biology

Answer 1

You ever see those toys that you put your hand on a bed of pins and the pins take the shape of your hand, [like this?](https://images.app.goo.gl/2PRvUxN2E5G16ZnV8) Well since you’re pushing down a bunch of pin with no gaps between them, those pins sorta combine to make a smooth surfact. If there were gaps between the pins it would feel significantly less comfortable. Now picture those pins to be grains of sand