In the picture you can see just a wooden bar with magnets inside that allows me to hang papers or pictures attached to a binder clip. Either for decoration or to keep them readily available for reference.

I made a small version of the bar to test the fit of the maple plug into the cherry bar:

I made holes using a CNC milling machine into a cherry bar to fit strong neodimium magnets that I glued in place using epoxy. The maple plugs will be glued on top to hide the magnets.

Here there are the plugs already glued in place but whithout applying any finish to the wood.

Now I can just get a binder clip in any paper or picture and throw it at the bar to keep it at sight.