They do this in order to absorb water before it is evaporated.
It has a strong odor and absorbs water from the air.
Generally they absorb water from 50 to 500 times their dry mass.
And it has a most astonishing capacity to absorb water.
However, I would think that clay does not absorb much water.
Benefits include that they move with the structure and do not absorb water.
If you have 70 percent humidity, there's not a lot of room left for that air to absorb water.
The porous stone has absorbed enough water to hold her down.
The blue form will absorb water from the air and turn red again.