This may be a good strategy for the winter when you want to warm the room.
Turn blinds up or down for privacy.
Blinds turned down it may make it easier for peeps to peep in.
When the blinds are tilted down they could look pretty aesthetically but they provide less privacy as it creates larger gaps between the slats.
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.
It gives you better privacy.
Tilting the window blinds down directs light and heat into the heart of the room.
With the blinds facing up the inside appearance may not be as appealing as when they re down but you reap greater privacy benefits.
Tilt them down and the blinds look softer and arguably better.
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.
For heat control for summer.