What about 'Earth and Sky' then? In the morning sun is rising, later we cannot see this fact equally clearly. In the right angles of the Tihuanacu style they couldn't have written differently, one henua upwards, another horizontal: The path of the sun during the day.

There is no path of the sun going down. Interest is focused on the period up to noon. That I have written somewhere earlier, I think it was when explaining why in Q there is no description of the day-after-noon.

The 'Staircase Sign' is just a variant of 'Earth and Sky'. Like the path of the sun in the frieze on the Sun Door, meandering up and down like a snake. That snake is built into the famous Pyramid of Kukulkan at Chichen Itza.

The Feathered Snake (Kukulkan, Quetzalcoatl etc) is the path of the sun. Feathers, because the sun is flying. It must be a bird, therefore feathers. GD11 (like Horus in Egypt) is a picture of this sun bird, the one at the top in the hierarchy, the bennu.