Choose just one. You do not need to work through the list.
- A colour that appears in two different places.
- A sound that gets quieter when you stop moving.
- Something ordinary you have not looked at closely before.
- A small change since the last time you were here.
- A detail you would like to remember tomorrow.
Keep the observation small enough to say in a sentence. If you want to return to it, give it a little room in your notebook.
Try the same prompt on a familiar route. The answer will not necessarily stay the same.