There already are also "ceiling roombas" holding up by sucking[0]. (I don't know whether they can actually do ceilings or only vertical surfaces for now, but i

There already are also "ceiling roombas" holding up by sucking[0]. (I don't know whether they can actually do ceilings or only vertical surfaces for now, but it seems if you could build the latter product you would also be able to make the former) [0] — https://youtu.be/jO-diCFjfms https://youtu.be/jO-diCFjfms