What can i use to stick posters on my walls?

Question:

What can i use to stick posters on my walls?

i want to put posters on my wall without using:
tacs;
tape ;
anything tht can be seen.
-i just want it to look like that poster is just there. i dont want to see the adhesive.

Best Answer - Chosen by Asker:

go to office depot they sell white putty. This will hold a poster nicely.

And when done, the putty will leave zero mark on the wall.