For flat roofs, a skylight in the ceiling, of course with electrically operated sun protection. Possibly also as an escape window to access the roof from inside using a ladder.
Above, I installed an aquarium that is 2.50 meters long, 80 cm high, and 70 cm wide into the wall between two rooms. One wall is covered floor-to-ceiling with artificial rocks, which looks great together with the aquarium. The wall in the other room is fully mirrored.
Wow! Show-off. PHOTO????!!!
I have planned a 2mx60x60 tank. The floor is specially reinforced for heavy load. However, it has not been realized yet.
Covered entrance with as few steps as possible. Children's room without collar beam. 2x level-access tiled showers. Pantry and a cellar room with natural light. Covered area of the terrace. Dressing room. Open kitchen with lots of counter space and a Downair system (exhaust hood).