Walking along the rivers, you can find a place like this. A small area devoid of grass looks almost dry. You can step on the soil and feel its softness, but you will not begin to sink. However, just take a few steps and your legs will be stuck in a viscous and heavy mud. Yes, you are trapped in natural clay.
In this video scene you will see how Tiny walks through clay mud. Unsteady wet soil sucks in her legs and fetters movement. Tiny tries to escape from the captivity of the mud, she pulls out her legs but plunges them again. All this is accompanied by sucking and gurgling sounds.