The rest of us call it the dark side metaphorically.
Well.
- No enlightenment without perception. Light is what reveals all things to the eye. Unseen, unrevealed, they remain in darkness.
- From full moon towards new moon, the darkness from the dark side of the moon slowly creeps upon the bright side of the moon! The moon isn't turning around. But the new moon now has two dark sides.
So, let us refer to them two sides as "front" and "back". Or else.
perl -le'print map{pack c,($-++?1:13)+ord}split//,ESEL'