Tilt them down and the blinds look softer and arguably better.
Turn blinds up or down for privacy.
This may be a good strategy for the winter when you want to warm the room.
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.
However having the rounded side facing out may not be as aesthetically pleasing as when the rounded side of the slats faces in.
It gives you better privacy.
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.
With the blinds facing up the inside appearance may not be as appealing as when they re down but you reap greater privacy benefits.
When the blinds are tilted down they could look pretty aesthetically but they provide less privacy as it creates larger gaps between the slats.