If you tape posters to the wall but don't want to keep carefully prying tape off the posters to avoid damage, I have a tip for you.
Lay down a strip of clear packing tape (i.e. wide, thin, smooth) on the back of the poster where you would normally put tape to attach to the wall.
Then you can put whatever tape you normally use1 to tape things to the wall on that strip instead of directly on the poster, and when you remove it it'll come cleanly off the tape instead.
Of course, that strip of packing tape is never ever coming off. Hence why I use clear packing tape, the least visually obtrusive option.
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Nightly Notes
I'm sure I can't be the first person to come up with this, but I don't know how I would even find out if someone else had. Above a certain effort threshold the answer is to frame things properly.
The internet wants to sell frames and tape.
I care about posters.
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For the record, I don't use electrical tape here because the thickness is bad for making good two-sided loops. ↩