"Tweenbots are human-dependent robots that navigate the city with the help of pedestrians they encounter. Rolling at a constant speed, in a straight line, Tweenbots have a destination displayed on a flag, and rely on people they meet to read this flag and to aim them in the right direction to reach their goal."I came across this link earlier and was not only captivated with the whole idea but pleasantly surpised at the results the creator observed.It reminded me of a similar experiment I conducted back in 2004. I took a plastic, toy robot (quite large but slightly-broken) and left him in the street outside my house, holding a sign reading, "I HAVE BEEN DAMAGED... PLEASE REPAIR."I then left for the day, assuming that the robot would either still be there when I returned, or that someone (student or child) would take it away, under their care, off to live a new life.When I returned, however, I was most dismayed to discover that Robot has been smashed to pieces. Not just cracked and broken, but smashed into a shower of many, tiny pieces so as to be completely unrecognisable.My housemate had observed the results of the experiment and filled me in: apparently the Robot had been set upon by a small gang of children, who, not content with the damage done by their fists and feet, went away and returned with a cricket bat and used that to smash Robot into smithereens.