4. The letter X denoting the unknown can therefore be explained as due to this sign being used as the opposite of the sign of the eye (which once also by the Chinese was drawn as a circle with a black spot in its middle - the pupil).

In the dark the eyes are helpless. Nothing can be seen under the dark cloth. Uncertainty must rule there. And the 'outcome' is a game of chance.

The form of the circular eye in the sky is all-knowing - it can see everything below it. Possibly the abode of this eye of light was regarded as the circular top of the upside down cone of time, a place where nothing changed.

Moon, on the other hand, was closer to the earth and she obviously went through all the changes possible. She symbolized life.

The ancient Egyptians regarded the region of the polar circle as something radically different from the rest of the sky. The stars inside this region never went down, they were always hanging there above. They were eternal and could always be seen.

The entrance to the dark underworld maybe was written by vaha kai in the rongorongo system (and the exit by a reversed vaha kai). If so, then we can expect hahe glyphs to be found close to vaha kai glyphs:

Between the 'ears' we are inside the 'skull' and there is no light. Or there is a chaotic battle between the different shades of shadows. We are living in a cave and the shadows on the walls are not true beings, they are all in our imaginations.