Using an imageblock for several shapes

[Magnus Adamsson]

Is it possible to use a single imageblock to lay out several identical 
shapes on the same canvas.
I'm currently experimenting with my first shoes application and I just 
realized the bomb example here 
(http://hackety.org/2008/05/22/theImageBlockAtTheBottomOfShoes.html), 
confused me into an enormous memory leak.
Calling the bomb function several times seems to create a new image every 
time.

I could do
@bomb = bomb 0, 0
But if I just use @bomb.move to lay the bombs out I will need to make 
several images (one for each bomb), which would be wasteful.

//Magnus