The other day @seanlilmateus wrote a quick face detection script using MacRuby: https://gist.github.com/1386468 I cleaned up his script and made it more Ruby-like: https://gist.github.com/1417463 as well as added support to pass your own image. You can try the script your self easily: $ macruby -e "$(curl -fsSL https://raw.github.com/gist/1417463/8cd0150bf5de962468897b3da093c870a5fb53da...) ;" While the script is far from perfect, I was thinking that it would be interesting to see the "MacRubyficiation" of a code written by someone who probably knows Objective-C/Cocoa but is new to Ruby. - Matt