I have, however, created some "rules" for myself while shooting. For instance, I avoid shooting anyone who appears to simply be listening to music on their iPhone. I also try to gauge the subject's awareness of his or her surroundings before I photograph him or her; if someone is quickly checking some information on their screen, they don't fall into my requirement of "oblivion," so I don't photograph them. I try to watch their behavior as they walk toward me and assess if they're really engrossed to the point where they're truly oblivious to what's happening around them.
I feel that this obsessive relationship with technology - and lack of connection with the reality that surrounds us - is endemic in our society, and it will ultimately have a negative effect on the development of the individual and society at large. How that manifests in the long-term remains to be seen.