Hooks and wires
That is the solution if you wish to hang artworks, pictures, posters or photos, but do not want to attach them directly to the wall, because that is possible and then threads and hooks are available.
You will see various variants here; Mini and heavy suspension hooks, Stas Evoluon hooks, Perlon wire, Twisters for mounting in the rail and Gliders for lateral displacement.
ArtiTeq and STAS even offer complete sets. For example, you can use Ratchet Hooks, Zippers and Micro Grip Hooks to determine the correct height of a panel on the tensioning wire by squeezing it between the index finger and thumb and releasing it at the desired location.
Really a page with useful tools to give 2D material the right place in the room.