411 REFERENCE · Wikibooks
Smalltalk Programming/Preliminaries
Reference material by Wikibooks contributors. This retains its source identity and is not 411 news reporting.
Smalltalk is a fully object oriented language.
The most important and consistent ideas in the language are that:
there are objects
send messages to objects
get back an object as the result.
So 2 + 3 is considered as "sending a message + to object 2, with argument 3 and the result of the message is another object 5"