Okay, "world's coolest" may be a bit of a stretch (that title still goes to
NIST's F1 atomic clock in Boulder, Colorado), but what Inga Sempe has created might fall just shy of it. It's analog
and digital, with the hour and minutes hand rotating as would a normal clock, but at the end of the clock is a digital
readout which independently orients itself so it's always readable (we suspect some weight or gyroscope action just
like the taxi hubcap ads). Unfortunately, this clock is a
one of a kind (and how), so expect to see some crappy Hong Kong-knockoff on eBay any day now.