Metaprogramming Ruby by Paolo Perrotta has the best explanation of Ruby's object system I've seen. It's a must-read for anyone working with Ruby, even if you h

Metaprogramming Ruby by Paolo Perrotta has the best explanation of Ruby's object system I've seen. It's a must-read for anyone working with Ruby, even if you have no interest in metaprogramming. Despite the title, it's a very approachable and widely-applicable book.