David Smith feels the activity rings are too hard to read. I agree, they are hard to discern between almost closed and closed. But I feel a better way to show this would be to have the last quarter of the ring fade out, and then restore it to normal again once closed. This is because we are much better at seeing differences than absolute values, and with David’s suggestion you would be hard pressed to see the difference between three almost closed and three closed rings at a glance.