Photos: Toyota's mobile, musical robots

It's unclear how much fun a Mobina drag race would be--the robot tops out at 6 kilometers per hour (3.7 mph). On the other hand, it can negotiate rough ground and can even handle steps because the left and right wheels are capable of independent vertical movement. It can travel about 12.5 miles on a one-hour battery charge.

Photo by Koichi Kamoshida/Getty Images