Robotic Butt a Very Strange Tail
You have to wonder how this concept originated
The University of Electro-Comunications in Tokyo refers to this as
“a buttocks humanoid robot that expresses various emotions with organic movements of the artificial muscles.”
And, according to the embedded video, the project’s purpose is twofold: to advance the “innovative use of robotics technology and its purpose,” and “to raise the argument as to what emotions will be manifested in the minds of people who communicate with Shiri.”