This is very cool. I notice that if i press on a single position for a while (im using my phone) it creates either a positive or negative "bubble" that seems to persist for a long time after I've removed my input. The interesting about this is, if i then cause a disturbance anywhere else the "bubble" pops. Why does this happen? Is there a time delay between my input and the bubble popping, or is there some nonlocal interaction going on?