This project by Allen Bukoff is absolutely fabulous!
I have included one graphic and a bit of text, but you need to visit the site to get the whole picture.
[[image:bukoff-hole.gif:Portable Hole by Allen Bukoff:left:0]]
The (w)hole story is can be found at: http://www.fluxus.org/FluxusMidwest/PortableHole/index.html