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Step 7: Use posterboard to create seamless background

Picture of Use posterboard to create seamless background
Again, I did not want to use tape which could tear the box and the poster board, so I cut notches into the poster that fit into the tabs on the 'back' panel. I set the poster's notches into the 'back' panels, then laid the 'top' panel on top of it to hold it in place. It worked out great.