Tilting the window blinds down directs light and heat into the heart of the room.
Turn blinds up or down for privacy.
When the blinds are tilted down they could look pretty aesthetically but they provide less privacy as it creates larger gaps between the slats.
Tilt them down and the blinds look softer and arguably better.
With the blinds facing up the inside appearance may not be as appealing as when they re down but you reap greater privacy benefits.
With the slightly rounded side facing out and the concave side facing in you have better light control in the room with the blinds up than if you were to turn the blinds to face down.
When the blinds are turned up the rounded side faces outward.
When the blinds are tilted up they allow better light control in the room.
For heat control for summer.
Blinds turned down it may make it easier for peeps to peep in.
Blinds turned in this direction offer more privacy and light control since the convex side faces the window blocking light or views from the outside.