word of the week: LOUVER
LOUVER (also louvre): An opening fitted with slanting fixed or movable slats to admit air or indirect sunlight but exclude rain, snow, and direct sunlight – just like the blinds you likely have hanging in your bedroom. The slats themselves are also called louvers.
This is a picture of the aluminum louvers that make up the modern wing’s “flying carpet“. They admit soft northern light while protecting the upper floor galleries from harsh southern light.