Button of any shape

[aspoerri@Athena.MIT.EDU]

Hi,

I would like to create buttons that can be of any shape.
Let's say, for example, I want buttons whose shape is a polygon.
How difficult would it be to create them ?

I have studied the documentation extensively, but I could
not quite figure out how I could replace the rectangular 
response region of a standard button with a polygon.

I am a graduate student at MIT working on a visual
interface for information retrieval, and I am using
MacLisp as an enviroment to prototype the interface.
Your help will be greatly appreciated !

Anselm Spoerri
CECI, MIT