Jilly's post made me deep dive into Heidi Callier's Instagram and a pic reminded me that I keep meaning to ask about curtains. No matter what I do, there is always a part of my curtains that sags or bends a bit. I can never get that crisp-looking symmetry.

Is it the fabric, the rings, or the header? A bit of each? Or is it just an illusion for pictures that gets messed up shortly after the picture is clicked?