A few years back, and as a promotion for Suspended in Language, I had some tippe tops made. They were so popular that I broke my own (unwritten) rules and made an extra batch after the first one ran out. But as the saying goes, "fool me once...". So, they really are all gone now.
But! Don't despair. You can make your own:
The video is courtesy of The Automata/Automation Blog, which you should visit because it is quite nifty.
But! Don't despair. You can make your own:
The video is courtesy of The Automata/Automation Blog, which you should visit because it is quite nifty.