This is a closeup of a Byzantine mosaic.
Note the Lunate Sigma and the style of the Alpha.
Now consider the handwritten letters on this manuscript page and how the letter coloring matches the illustration of the saint writing.
Study how material medium and location influence the layout of the lettering and the shape and weight of letters.
One set on a slightly curved surface made up of smaller tiles and the other written in ink on a tinted background on vellum.