This technique can be used while walking.
Notice changing scenery while some objects are appearing in and disappearing from your sight.
No need to identify the objects that appear or disappear. In this technique, we are aware of the entire scenery rather than paying attention to the small details.
Labeling technique makes the practice easier for beginners. You can mentally say your experience with a word or phrases.
“changing” when scenery is changing in your sight.
Optional: use this technique to be aware of mental phenomena (such as thoughts perceptions, feelings, consciousness) are changing in the mind.
See also: Mindfulness of Appearance and Disappearance