TIXClock

Millions of patterns are possible with the futuristic-looking Tix clock, yet the clock is extremely simple to read once you grasp the basic concept. The four seperate fields act like the four digits of a digital clock. The value of each digit is simply the number of illuminated squares in each field. So any given time of the day may have thousands of different ways of displaying the time.
Design is taken from think geek article.