This is an enhancement to my CleanWatch face that adds a digital Roman numeral mode! It still shows battery, heart rate, date, steps, and distance (miles or kilometers).
To switch between Roman numerals and regular digits, touch any two corners of the display. You must touch two different corners and you must touch them between 0.5 seconds and 2.5 seconds apart. If you touch the same corner twice, or touch two corners too fast or too slow, the watch will not change modes. I did this to prevent accidentally changing modes. If you cannot change modes, you may be touching too fast. Just relax and try again or try different corners. Enjoy!