But why describe 'the body' as an immune system, when the description refers to nothing in particular (unlike the lymph or digestive systems)? The body has man

But why describe 'the body' as an immune system, when the description refers to nothing in particular (unlike the lymph or digestive systems)? The body has many elements that are nothing to do with health and fighting disease - not everything is 'immune system'. When you say "we live in a microbes world" this indicates one way to look at things. You can also approach things from different perspectives - eg engineering, chemistry, physics, politics, philosophy, etc - there are many approaches to any part of reality. While a different perspective might give an interesting angle, you do see that the underlying reality of 'the body' has not changed? And that it is a misuse of language to say and treat something is a physical thing, when it cannot be pointed at? Making a term ('the immune system') broad and refusing to use an existing term ('the body') is, to me, a sort of trick to conjure something into an imaginary existence. To me, you are not saying something meaningful if you say 'the body' is 'the immune system'. Whereas you are saying something meaningful when you point at guts etc, and say 'this is the digestive system'.