Paulig Muki is a coffee cup with an e-paper display that’s powered by nothing more than hot coffee. You can download your own pics on the screen, but that’s not very revolutionary, right? We have all seen the “I’m the Boss” mugs before. The fun starts when you fill your first cup in the morning and your friend’s messages appear on the screen. It might be hilarious, exciting, romantic or even embarrassing. That depends entirely on your friends.