We're sorry. This is just really weird. We have no idea why people make these.
Something like this takes time to conceptualize and actually build and test and get to function and respond to touch.
This person must've really wanted a robo butt!
It's supposed to move realistically but we're not sure how many butts can get larger or smaller at will.
Check out the video (above) to see SHIRI, the world's first fully robotic butt!