Circular windows can be covered with cellular shades or wood shutters. A cellular shade of this style will be inoperable, but can be made with fabrics to match other shades in your home.21 Apr 2015
How do you blackout a round window?
https://www.youtube.com/watch?v=CH1OTw6hvY0
How do you make a shade for an arched window?
If you aren't concerned with fitting your curtains to the shape of your arched window, covering it is simple! Use a drill or screwdriver to install a curtain rod above the arch and hang curtains or drapes that will cover the entire window. You can also cover the lower part of the window and leave the arch open.