As others noted, this is working outside and with some sort of adhesive (about which one might want to know lots more), and as for a level surface, well, that's

As others noted, this is working outside and with some sort of adhesive (about which one might want to know lots more), and as for a level surface, well, that's generally going to be the case in almost all cases anyways. That said this robot doesn't do rebar, and that's a big deal.