I'm playing with morphs but having trouble getting it achieved. I have a set of geo coordinates that form a polygon. Over the polygon I want to lay a grid. The polygon I do with lineMorph ^ lineMorph ifNil: [ lineMorph := (LineMorph vertices: self coordinates color: Color red borderWidth: 1 borderColor: Color black) ] The grid I do with activeGridOn: aMorph | min max stepHorizontal stepVertical | min := self coordinates min. max := self coordinates max. stepHorizontal := (max x - min x) / 10. stepVertical := (max y - min y) / 10. min y to: max y by: stepVertical do: [ :y| min x to: max x by: (stepHorizontal) do: [ :x | | r | r := Rectangle origin: x@y extent: stepHorizontal@stepVertical. Transcript show: 'drawing rectangle ', r asString; cr. aMorph addMorph: (BorderedMorph new position: (r topLeft); extent: (r width@r height); color: Color red; borderWidth: 1; borderColor: Color black) ] ] But I cannot see the rectangles because they are too small. It seems the coordinate systems of the line morph and the added morphs are different. Is there a kind of transform need so that the line morph and an added morph can have the same sized coordinate values? Norbert