One of the main challenges for priests and artists in Ancient Egypt were to combine the osirian and solar cosmogonies in the funerary literature and iconography.
The two main pillars in the belief of resurrection in Ancient Egypt were the myth of Osiris and the solar theory. The central aspect in the first one was the resurrection and new life in its most human version: a human body (Osiris), which needs to be embalmed and revived for the eternity. In the second one the stellar body (the sun-Re) did a cyclic trip through the sky; it died in the night and sailed in the solar bark through the dark sky; in the morning after the sun came back to life renewed plying the clear sky.
In Ancient Egypt both ideologies, due to its importance, were quickly conciliated as two versions of a same concept. In the thinking, ancient Egyptian priests could unite Re and Osiris in the funerary texts through the narrative, that is why, for instance, in chapter 67 from the Book of the Dead the dead Osiris wants to get out from the tomb and get into the solar bark of Re.
What happened in the art of Ancient Egypt?