The spaces between the top of a window or door and the ceiling or roof, often filled with decoration.
Spandrils are usually part of buildings and can be very beautiful.
Examples:
The spandrils above the door had pretty flowers on them.
The spandrils on the old building were very fancy.
She looked at the spandrils and thought they were nice.
The spandrils looked like they were talking to each other.
The spandrils were so big, they almost touched the ceiling.
The spandrils were the best part of the building.