Anchor point.

 From:  andy (ANDYJAGGY)
3990.1 
I haven't figured out yet what tells Moi how to scale objects with the brackets. Sometimes when I drag a bracket it scales the objects from the center. Other times when I drag a bracket it scales the object from the opposite side. Both behaviors are great, but I need to able to control which it uses. I can't seem to figure out how to do that. :)

Andy