A viewer sees into these images, towards a distant illumination which becomes part of the work. Receding in the space, bright discs resemble lunar or solar images, or allude to lenses, optical benches. They are recordings of astronomical photographic plates with details - photographic images of stars - visible within them.

Two transparent back-lit Gabor holograms
(by the technique of the inventor of holography (1948)

source: wengam.com