I was giving a talk on risk and undo. It was such a nice image that I also used it on my change of address cards . Since then it has been the place I put the occasional oddity and comment that doesn't really belong anywhere else. I hope you find things here to inspire and intrigue you. If you think about it, the world of computing is rather like the world of magic.
Some systems try to bring it all down to earth - desktop metaphors and virtual reality.
But if you want reality, the real thing is infinitely better. Not like the real world at all. In fact a bit magic. Undo is certainly rather like that. We've all had times in life when we wish we could turn the clock back, just step back a moment and unsay what we've just said, or undo what we've just done.