"Last year David Friedman published on his blog Ironic Sans an interesting design concept for something that he called The Bulbdial Clock. That's like a sundial, but with better resolution-- not just an hour hand, but a minute and second hand as well, each given as a shadow from moving artificial light sources (bulbs). We've recently put together a working bulbdial clock, with an implementation somewhat different from that of the original concept." - Alejandro from Bookmarklet