The dilemma: All areas in the apartment larger than a closet have windows Bathroom has one large window My way of blocking light from this window must be easily removed and reattached I would like it if it didn't leave behind ugly things to look at when the bathroom is busy being used by everyone else in the apartment. Setting it up cannot take a significant amount of time. I will be assembling and disassembling my entire darkroom every time I print. Has anyone created something that solves the problem of external light on a temporary, repeatable basis? Most of my thoughts right now are revolving around a board/blackout curtains cut to size and taped down each time with duct tape, but that strikes me as exceptionally error prone. Thanks all!