The Pentagram holds the star in this urchin in essence They are so painful when they are alive and so beautiful afterwards. When you put a light inside it makes a star pattern of dots 360 degrees on the wall.
https://steemit.com/geometrychallenge/@southsea/geometry-challenge-week-6-stars#@godo/re-southsea-geometry-challenge-week-6-stars-20171207t070440522z
