- Use percentage of mobile phone to represent time, e.g. 50% represents noon, 75% represents 6pm, 0% represents midnight
- Three balls bouncing and colliding with each other, one represents wind, one represents temperature, one represents chance of rain, color varies with the value. they are inactive at night and active during the day
- Use volume level to represents time, volume will be shown on screen as waves
- Footstep count to represent time
- calories intakes