Is there a doc like perlguts/illguts for ruby?

I recently enjoied the illustrated perlguts as fun and easy way to see how things are implemented without 开发者_Python百科the need to dig through sources and would love to read such documentation for ruby.

Perlguts provides some information on the workings of the Perl interpreter and describes how to use the Perl API. Illguts i an illustrated version of perlguts.

Are there similar docs for ruby?

Here is some stuff along those lines:
The Ruby Hacking Guide (old, but contains some of that nuts & bolts info)
http://dev-logger.blogspot.com/2008/06/ruby-internals-by-patrick-farley.html