Q asks: "What is the significance of the colors, design and symbol above the dome?"

Hmmm. Above the dome. Could mean generally "above the temple dome building," and so it would refer to all of:

* the two GOLD cockatoo sculptures

* the GOLD dome itself

* but also, maybe more specifically ABOVE THE DOME, might also be referring to the much-ignored small GOLD SPIRE right on top of the dome –the highest point of the structure

The gold color seems to refer us again to the ancient Egyptians and their belief that gold was "skin of the gods," and more specifically the sun-god Ra. This becomes important when we consider the other symbols on the island and their symbolic significance. Especially when we think of the importance of astronomy and constellations to the Ancient Egyptians.

Note that the Luciferian nation of the Sacred Masculine and Sacred Feminine is encompassed by the Ancient Egyptian myths too. If we look at Epstein's dome and spire, is it possibly a symbolic marriage of this sacred feminine and masculine (the ideal in the Luciferian philosophy (cf. transgenderism))?

Note the spire (obelisk) and dome (capital building) in Washington DC, which some consider to be symbolic representations of Sacred Masculine and Sacred Feminine… which all connects to the cult of THE SECRET SUN.

I'm thinking the Secret Sun is the SIRIUS star. The dog star. The brightest star. A very important star in many religions, especially the ANCIENT EGYPTIAN religion.

Which ties sacred masculine (Ra) with the sacred feminine (Hathor) the Egyptian female fertility "goddess of the sky," who was intimately entwined with Ra, as both lover and mother. The symbol for Hathor was the COW, giver of milk, and the Milky Way.