In the spirit of classic sci-fi at the dollar store, here is a pack of six Christmas balls:
![Christmas ornaments Christmas ornaments](workbench/pics/scf/2020/11665a.jpg)
These are simply foam spheres with mirror pieces glued on them.
![Ornament loop removed Ornament loop removed](workbench/pics/scf/2020/11665b.jpg)
Pull gently, and the loop can be removed without damaging much of the ornament.
![Ornament Ornament](workbench/pics/scf/2020/11665c.jpg)
The mirror pieces work well around the middle of the ball, but there are gaps at the top and bottom.
![Ornament painted Ornament painted](workbench/pics/scf/2020/11665d.jpg)
I touched up the ornament with some Coat d'Arms acrylic silver. The paint also helped 'glue' down a loose mirror bit where the loop was pulled out. Alternately, a wash might do a better job of reaching every white spot.
![Base inserted Base inserted](workbench/pics/scf/2020/11665e.jpg)
A base can then be inserted into the soft styrofoam. Glue optional.
![Space buoy! Space buoy!](workbench/pics/scf/2020/11665f.jpg)
The Orions are blocked by a mysterious space buoy. It moves as they moves, and it will not let them pass.
![Space buoy Space buoy](workbench/pics/scf/2020/11665g.jpg)