Get knotted

This week's WBC is "Twisted".
Not that straightforward, and easily dangerous ground.

So here's an quickie as I'm just back in the house.

This is the kitchen blind.
I am forever untangling it.
I have no idea how or who tangles it.
Just lucky I am a patient puzzler, or it would have been in the bin long ago.
I can untangle any knot.