Stupidly Small eInk Font

I have the new Watchy eInk watch. It has a cute little screen with a resolution of 200x200 pixels. How much text can we cram in there?

A typical watch face looks like this:

My new watch face is far superior and looks like this:

That's using the GNU Unifont - which works brilliantly on tiny devices.

HOWTO

• Download the GNU Unifont
• Download and compile HarfBuzz
• Run the HarfBuzz Font Subsetter
• ./hb-subset unifont-15.0.06.ttf abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789\!\"\£\$\%\^\&\*\(\)\-\_\=\+\@\~\'\#\,\.\/\?\:\;\<\>\\\| -o latin.ttf
• Convert the output to AdaFruit's GFX format using truetype2gfx (set the Font Size to 5 points for about the smallest you can reasonably go. But Font Size of 8 is a better compromise between size and readability.)
• Follow the tutorial to create a new watch face
  • NOTE If you put the font file in the same director as the .ino file, you need to include it using #include "latin5pt7b.h"
• Compile and upload to your watchy via USB.

Nice!

Next Steps

I dunno. Make it bounce around? Print a Shakespearean sonnet? Give me some suggestions!