Artist Dale Forward (DF ART) uses some pens, paper and a pair of 3D glasses to help you see the inside of a hand in his new video.
You can order an original hand drawn drawing just for you on his facebook page (More info on link). Each hand is an individual drawing and comes with 3D glasses!
Find Dale on his page DF ART https://www.facebook.com/dfartwork/
More info: Facebook