síiiiii, ¿Cómo?

creo que son placas pintadas en negro y despues con pistola pintura blanca con algun polvo de cuarzo o algo parecido pero no estoy seguro

Buenas, efectivamente son placas pintadas de negro mate, con fibra óptica de distintos diámetros e iluminación led para hacer el efecto de techo estrellado

Hello I apologise it has taken so long to respond. I think that the question was how was the ceiling constructed?

The starry ceiling is a product called Hardiplank or fibre cement sheeting. Plywood sheets would have worked the same if it was not in a pool house. It was painted Dulux Monument (Charcoal black) and then the LED fibres were drilled through from above by a young apprenctice crawling through the ceiling void.

Hope this helps answer your question?

Regards

Suzie