lua metatables?

Can anybody explain me or at least refer me to an easy to understand article, tutorial or whatever about lua metatables? I’m pretty new in this world, and would like to know more about them.
Thanks in advance! [import]uid: 105206 topic_id: 26620 reply_id: 326620[/import]

This is from the book: http://www.lua.org/pil/13.html
I learned from there =D [import]uid: 138716 topic_id: 26620 reply_id: 107923[/import]

nice, thanks! i’ll read it! [import]uid: 105206 topic_id: 26620 reply_id: 108652[/import]