Tilt them down and the blinds look softer and arguably better.
Turn blinds up or down for privacy.
However having the rounded side facing out may not be as aesthetically pleasing as when the rounded side of the slats faces in.
With the blinds facing up the inside appearance may not be as appealing as when they re down but you reap greater privacy benefits.
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.
When the blinds are tilted up they allow better light control in the room.
Tilting the window blinds down directs light and heat into the heart of the room.
When the blinds are tilted down they could look pretty aesthetically but they provide less privacy as it creates larger gaps between the slats.
Blinds turned down it may make it easier for peeps to peep in.
When the blinds are turned up the rounded side faces outward.
For heat control for summer.