Binary Clock: Can You Tell the Time?
It is fascinating to watch people who do not realize that the changing LED patterns on this clock face do in fact show the time: "Well... Maybe it's a clock?"
               "Yup, you are getting there!"
"But what time is it?"            http://lmgtfy.com/?q=bin%C3%A4ruhr 
Circuit diagrams for such clocks can be found on the Internet, here for example:  http://pitts-electronics-home.de/electron/schpluhr.htm
Since the circuit board layout exceeded the 40 mm maximal travel of my MF70 CNC mill, I designed a new PC board for surface mount components. The PCB real estate was pretty tight, but a 10° engraving bit is well suited for isolation routing of such small traces. 

This is how the clock looks after I put it into a small plastic enclosure. Well, can you tell the time?
 
It is exactly 16:13:21.

 

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