[Newbies] How to construct a PolygonMorph?

[Tim Rowe]

I can see PolygonMorph Class>>vertices:color:borderWidth:borderColor:

But I can't work out what it expects for vertices. Could somebody give
me an example of how to create a PolygonMorph? (Or, better, tell me
how to find things like this in the documentation, so I don't have to
keep bothering you folks!)

Thanks.

-- 
Tim Rowe