I hadn’t seen this in person and saw it for the first time on TV where Japanese people come to Taiwan as toursists. Since the show I’ve noticed it more and more. Here is a video clip from the tent setup at the lantern festival in February.
The underground mall at Taipei Main Station also has a spot with fortune tellers in the front and butcher knife massages in the back. I would like to try it and it really does look totally safe but I think I’ll wait til the baby comes out.