The face of Christ dominates the apse of the Cefalù cathedral. It is coeval to the construction by king Ruggero. Each detail has a symbolic purpose, a property of byzantine art.
The light (gold) covers three quarters of the whole space (three means the mystery of Divine life, four means the cosmos: Divine life is represented inside the cosmos).
The face of Christ is crowned by a halo containing the jewelled shining cross like a crown (Christ the king, priest and prophet), he has two tufts of hair crowning the front (he is God and man), his garment is porphyry gold (the colour of Divinity) and his mantle blue (the colour of humanity); in Him, God took humanity on Himself.
The hands, at the far end of the mosaic, frame the figure and show the salvation deriving from Him.

"In the light of a king's face there is life, and his favour is like the clouds that bring the spring rain" (Proverbs 16,15)