Thought process:
Glue = sticky
Sticks things together permanently.
permanent = forever
What if I'm not ready for that kind of commitment?
Paperclips? = already invented
Paperclips = metal
Metal heavy = paperweight?
I can't stick a paperweight on the wall.
What if paperweight somehow stuck to the wall?
Paperweight to wall = glue?
Glue + wall = :( landlord
hmmm.....
What if the paperweight stuck to the wall somehow but was easily removed?
Maybe some heavy metallic substance that was attracted to another metallic substance that I can put on the wall?!
WHAT SHALL i CALL MY MARVELOUS INVENTION??
....
oh wait....