Ok guys I have a challenge, I have a small hallway space outside of my bathroom which I want to use for printing (Bathroom itself is too small) but one side is an open archway.
Any ideas on a cheap easy way to block off the arch so thats its light tight but still able to walk through without dismantling whatever is blocking the arch?

Attached is a rough outline of my plans, sealing off the doors/window is easy enough (Doors are pretty tight already and the windows has a blackout Velux Blind on it) but the archway is giving me problems.