can I make an object turn by its corner? if so how?
You might want to ask this question on a Powerpoint discussion forum.
This newsgroup is for a different program, Microsoft Access.
If you're using the Microsoft web interfaces, scroll down the list of
subject areas on the left and find Powerpoint. Just because Access is
first alphabetically does not mean that all Office questions should be
asked here!
John W. Vinson[MVP]