Bubbles are used to show the intensity with which buyers overtake sellers or vice-versa. Bigger bubbles would indicate an oversold or overbought condition, when there is more imbalance between sell volume and buy volume. They may appear sometimes on low volume - this may be a weak overbought or oversold indication. The big bubbles that appear on significant volume could be used to find divergences with price.
Multiple instances of the indicator can be combined to get a bigger picture.
In the indicator's settings, a ratio limit can be set for the overbought or oversold condition. Alerts for counters imbalance can be set to fire whenever the condition is satisfied.