[racket] How to get a pict-box into a slideshow?

Robby Findler writes:

 > Pict boxes were an experiment that didn't work out.
 > 
 > Picts, however, are still going strong and so you probably want just to use them.

It looks like picts are hard to avoid, since just about anything in a
slide is a pict.

But I liked the idea of a way to do manual positioning in cases where
esthetics matter more than functional relationships between items.

Konrad.