An aurora is a natural phenomenon which is characterised by a display of a natural-coloured (green, red, yellow or white) light in the sky. It occurs in the high altitude near the north and south poles of the Earth. Sometimes, from appearance to dissipation, it may only take a few minutes; Sometimes, it can last for hours. So to some extent, auroras represent luck. This puzzle combines the aurora with the tree of life, which addin…
