Now reading Exploded View by Carrie Tiffany:

In the manual you can choose to look at the parts, or the air in between them. The air in between isn’t nothing; it isn’t blank. If you make yourself look for what’s not there the empty spaces become parts themselves. The empty spaces become air parts, bordered by the metal and rubber… If you cast only the air parts in steel and assembled them the engine would be peaceful, then. It would be beautiful. The engine would be made from air.