3D Printed Hexagons
This is a small geometric toy by mars gizmo that’s oddly satisfying to play with. It can be used as a desk decoration. Ideally you need 4 small magnets for this toy. Designer used 6 mm diameter / 2.5 mm height.
If you don’t have any magnets laying around you could just print the pin at a shorter length and operate it from the top. It won’t have the same effect but it should still do the trick.