It’s not a skylight, it’s a fixture! This “Hole in the Wall” light fixture housing is cast GRG (Glass fiber Reinforced Gypsum). It mounts directly to the studs in a wall (or ceiling as shown here) and the edges are taped and finished like any gypsum board seam. When finished, this HITW Series fixture appears to be a custom-formed drywall “light niche.”
Fixture Highlight:
"Hole in the Wall" – HITW Series, 8" x 29" Aperture