There is a kind of glue called seamless glue, also called butyl glue. A box of 10 can stick 40 to 60 posters, which can be reused without losing walls and posters. There are several ways to hang pictures:

1. Pull a long rope horizontally against the wall and clip the picture on it.

2. Stick the picture on the heater, under the window sill, on the vertical plate of the cupboard and refrigerator.

3. Buy a whiteboard with a bracket, hold the picture down with a magnet and stick it on the whiteboard. You can also staple some pictures with a stapler and turn them over on the whiteboard.

4. Buy a big white board to hang on the wall or a big wall mat, and then paste the picture.