It's therefore useful for our brains to construct notions like "solidity" and "impenetrability," because such notions help us to navigate our bodies through the middle-sized world in which we have to navigate.
Per tant és útil per als nostres cervells construir nocions com "solidesa" i "impenetrabilitat" perquè tals nocions ajuden a navegar els nostres cossos pel món de mida mitjana en què hem de navegar.