This has a small geocaching connection, particularly for those who know what the O.C.B. is (google geocaching OCB for answers)
Dave Ulmer asked me to program a binary clock that matched an original design of his from 1969. It is done, and he has named it "Dave Ulmer's OBC" for Original Binary Clock.
It is downloadable
Here. Note that it is Windows-only.
If you run it, please let me know about any bugs.