Your comment brought back a memory: My wife was interning at Eli Lilly in their HQ in Indy in the summer of 1999 and they had an office mail robot that fits the

Your comment brought back a memory: My wife was interning at Eli Lilly in their HQ in Indy in the summer of 1999 and they had an office mail robot that fits the exact description you gave. I think it followed markings on the floor. Zero computer vision, when it came your way you'd better watch out, it nearly squished me against a wall while I was watching it.