GIFs of D-O's movements

[kresty]

Yea, I was sure they were delusional at first and a BB-8 style drive made sense, but this makes it more obvious that the edges are driven. I'm *guessing* that the tire bit is freewheeling and just moves when it drags on the carpet. One question is if the "tire" is soft, like rubber or something, or one person suggested it maybe has segments that are normally pushed up but spring down when weighted. (A couple of the frames look like there're shadows on them like maybe some such system had segments out of place.)