[plt-scheme] Yet another question. And this time: animations

Hello again,

Now that I have normal drawings settled, what about some animations? Are 
they possible?
I tried making moving parts via boxes which are set every 0.1 secs and 
then refresh the canvas, yet (quite logically) the screen blinks like 
that...
Is there a built-in way to make animations?

Katsmall the Wise
kela_bit at netvision.net.il