Asked
— Edited
Here is something you may find interesting, I sure did.
Rafiki Front Bumber
— Rafiki front bumper plugin: reads 4 proximity sensors via serial, updates ARC variables, blocks motor movement toward detected obstacles for SLAM
Try it →
The Sultan's elephant. These guys released this in London, England a bunch of years ago. There are a bunch of other amazing things these guys make in their workshop/tourist attraction in Nantes. Everything they make is like mechanical puppets (direct human control i.e. - ropes, hydraulics etc.)