A little robot that would patrol a beach picking up small plastic bits 5mm - 15mm in size would be amazing. There is so much of that crap on our beaches. It's c

A little robot that would patrol a beach picking up small plastic bits 5mm - 15mm in size would be amazing. There is so much of that crap on our beaches. It's crazy. Also making a robot move on sand, rocks, pebbles, keep out of the way of people and dogs. Navigate sand and rivers and the tide. It's hard for people to do, we see people fall over, or get wet feet from a big wave washing up the beach or get cut off by the tide quite often.