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Our most fundamental experience of the earth is that it is solid, and we walk on it. Solid objects remind us of earth, because we depend on them to remain as constant as the ground and not change suddenly.
Solid objects are discrete entities that have distinct boundaries. In human civilization, we use stones, bricks, and other objects as components to construct larger objects, such as houses and schools. If part of a structure becomes damaged, we can often repair it by finding and assembling the appropriate components.
The digestive system breaks down food into various components, and then re-arranges the components into new solids. For example, it extracts amino acids and then combines to build proteins that form and repair cells. Extraneous material is compacted and then excreted as solid waste.
Contemplate the way that a solid object retains its identity, even when all of its components are replaced. Your body replaces its cells continuously. The cells inside you today are not the same ones that were inside you a few years ago.
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