Well, more a backpack than the actual back, but metaphorically speaking close, nevertheless.
Alright, here is a challenge probably no cell phone camera can master (and probably regular cameras can’t handle either): Communicate to a friend (by photo) problems with lighting in your house. I’m trying to take photos that show the effects of my current lamps, how they light the place, the problems they create, etc. Does not work at all. Yikes!