Thanks Herbert and Bert (and thanks for your e-toy demo).<br><br>For me, the really interesting part is learning how to think in Squeak. I hadn't really seen this as an animation problem, so I was looking in the wrong place.<br>
<br>I will got and have a play with your various suggestions, and then come back when I am stuck again ;-)<br><br>Cheers<br>AB<br>