Akai Invert-O-Matic cassette deck

One of the more entertaining mechanisms for playing both sides of a cassette. The Akai GXC-65D Invert-O-Matic has a conventional single-direction transport, with an independent mechanism for lifting the cassette off the drive hubs, turning it over and replacing it. The process is triggered by the optical tape travel sensor detecting that the tape is stationary. See more about it at Electrokinetica: