GPS Clock with Binary Display

Some years ago I started making a GPS Clock with a 20 by 4 LCD, Yet another Arduino clock. It has been running since then as my shack clock. Now was the time for some additional functions, in the form of fancy variations of how to show time. I wanted a display coded in 0's and 1's, but I found that there were more than one way to do that.

The simplest one to read may be BCD (binary-coded-decimal) displays. They can be horizontally oriented like here: