The constraint is: NOT to make anything that looks like a hand, or even close to it, yet the fucntion and the use is the same. Yes. There will be that irritating noise.
Use: As a training tool by karate instructors.
Do you have any pointers or a radically different ideas that you can point out?
Any help is appreciated. (Ohh, BTW let me know how am I doing on my sketches?)