Empty wall to become white backdrop

way back when we had net cutains on the windows you used to use this coated springy wire that had eyelets on the end, these were attached to hooks screwed into the window frames and the wire was taught holding the net up, coudn't you use something like this that could be put up and taken down in minutes and would be much more unobtrusive
 
As above. Also, if the wall is white (or thereabouts) it will be fine without the bedsheet
 
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