3D Cinema sign that extended out over the "stage" below it. The painted concrete blocks in the school are notoriously difficult to adhere anything to, and don't even say "3M?" It doesn't work either. But double-sided duck tape can work miracles! We've been able to make things stay without issue with the double-sided duck tape. The blue protective peel on both sides can be frustrating to separate from the tape, but I've found that using my nail to scratch a corner can actually work much better than trying to separate it from the beginning.
Ombre 3D tree and a backyard movie party.