I also like to observe my environment both at home and outside. Oftentimes, I use one earbud so I can listen to my environment with the other ear. But when studying or working and need full attention, I plug in both ears and inform those around me so that if my attention is needed, they will have to tap me or call my phone.
When we are used to doing one thing, we tend to forget how important other things are. It's good to observe nature and its sounds; it's a refreshing experience.
Observing the daily realities of life gives a sense of being involved in this world.