It is difficult to believe that the most sophisticated computer is basically made up of stone. In particular, its nervous system is made of silicon, which is extracted from silica sand or massive quartz rocks.
It is also quartz crystals that pace the functioning of most of today's clocks. After extraction, the silicon is delivered to the electronics manufacturers in the form of "wafers" a few centimetres wide. Tens or hundreds of processors and circuits will then be carved on each of them, through an optical process during which they are held in place in vessels of silica of the very highest purity.
The expression "Carved in stone" has never been more apt as in the virtual world we live in today.