Mr Tuna, It would appear that aliens worship female humans (which is why they come to earth and delicately capture them with their soft-tentacled pseudopods). Once back home in a nearly weightless environment, they install these perfect specimens in brightly lit niches in their temples. Since space flight is quite expensive, even for a Mother Church encompassing 3/4 of Known Space, holograms of these deities are sold to visitors and pilgrims as souvenirs. Unfortunately, the black underbelly of the Market has made inferior 2-dimensjional copies of these images widely available, even to those who have not made the pilgrimage to Earth. [Please note that this explains the quality of the light, the architectural background, the tippy-toed position, the perky breasts, and the vacant other-worldly expression]