With a little bit of practice, it's pretty straightforward for a human being to do this, although we do have the advantage of having two feet on the ground and the use of our very versatile hands.
Men en lille smule øvelse, er det temmelig ukompliceret  for et menneske at gøre dette, selvom vi har den fordel at vi har to fødder på jorden og brugen af vores meget alsidige hænder.