When I was in uni we had this giant clock that would ring every hour.... one day I learned how great of a lesson it teaches us.
it was a reminder. when I was running across campus to my next class or stressfully thinking of my todo list i would hear the clock. i began to use it as a reminder of stillness. With every ring of the giant clock, I would stop. Take a deep breath. and take in my surroundings. Drop into my senses.