Flow
You may observe something as a stable entity, or you may observe the constant change in whatever we perceive. Sometimes change is fast, sometimes slow, but any experience may be observed as changing. For example, we may have pain on our bodies, physical or emotional. It may seem totally solid and firm. On the other hand, it may seem to clench or grow, move in waves or undulate in intensity.
To do this technique, any time an experience arises, pay attention to if it changes. If it seems completely stable, just keep observing it, enjoying its stability. If it seems that any part of it is changing in any way, note it with the word "Flow." For at least ten minutes, pay attention to any Flow you may observe, dropping deeper into it for as long as it remains, allowing it to arise and pass away freely.
Practice daily.