Warning: stop hanging your posters with two pieces of tape at the top corners
I watched my neighbor's $8 Ansel Adams poster curl up like a taco within a week of hanging it because she only taped the top two corners and left the bottom flapping in the hallway AC draft. Everyone thinks four tape squares ruin the look, but nobody mentions that paper breathes with humidity and the bottom edge always warps first, which is why I switched to taping all four sides plus a tiny loop at the bottom center. Has anyone found a tape that actually comes off apartment paint without taking a chunk with it?