The back of the Yamaha Tenori-On looks much like the front. Battery compartments for 6 AA batteries on the left and right sides of the frame are the giveaway that you've got the instrument turned backwards. Also, while the back of the Tenori-On is just as pretty as its front, the buttons on the back are for show only and do not function when pressed.
Photo credit: CNET Networks/Corinne Schulze