Anybody who’s spent anytime around dogs knows that their mood is most always reflected by their tails. They’re like disposition semaphore flags tied to their butts. If only people were as easy to read. Well thank goodness for entrepreneur Wei-Chieh Tseng who has developed the Mood Tail. Just strap this puppy on and start wagging at the world.

Currently it’s controlled with a Wii nunchuck or with “emotion cards” that you can use to alter your displayed feelings. If only there was some sort of device that could detect your mood and adjust the tail automatically… maybe a sensor that could be worn as jewelry. You know, like a ring or something.