Ruby's Best Feature?

It's the title of Rich Kilmer's 2008 first post. You should read it even if you are not a Ruby programmer.
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He concluded that:

In my experience, this is the single most important feature of the Ruby language---capturing the domain in a language the entire team can speak. If you believe clear communications is an essential quality of highly effective teams, this feature is something that you should strive to exploit in your own Ruby projects.

Do you want to know what do I feel after reading this post?

I want to read Martin Fowler's Domain Specific Languages Book immediately and write DSL's patterns described in the book in Ruby.