What's the real meaning about 'Everything that exists is an object' in R?

Question

I saw:

“To understand computations in R, two slogans are helpful:

• Everything that exists is an object.
• Everything that hap

Answer 1

I love that quote.

In another (as of now unpublished) write-up, the author continues with

R has a uniform internal structure for representing all objects. The evaluation process keys off that structure, in a simple form that is essentially composed of function calls, with objects as arguments and an object as the value. Understanding the central role of objects and functions in R makes use of the software more effective for any challenging application, even those where extending R is not the goal.

but then spends several hundred pages expanding on it. It will be a great read once finished.