Hanging pictures without drilling in a rental apartment is perfectly possible with three systems: removable adhesive fasteners, shelf or furniture support, and gallery rails. All three work, but none will work on every wall. What will work for you depends on the weight of what you want to hang, the type of surface and what your contract says. I'm going to get straight to the point with each option and, above all, the situations where they fail. Which is what you really need to know before you buy anything. This conditions everything else, and many people ignore it. A poster without a frame (fine-art paper, A3 or A2) weighs between 100 and 300 grams. Almost any adhesive will do. But as soon as…