Half a croissant, on a plate, with a sign in front of it saying '50c'
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Sonic Theremin-gy Nail Locator

So you can hang the clock
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Attach the sonic nail finder onto the center of the back of any picture, clock, or "purely decorative" torture device that you are trying to hang. Using wavy-handy-electromagnetic spacial theremin type technology in a small chip and CR2025 battery, the small piezo speaker in it produces the highest pitch when the nail is directly above it, thus allowing you to hang said picture on its hook with ease.
RayfordSteele, Nov 16 2020

Engineers Explained http://bcn.boulder..../engineerhumor.html
From "The Dilbert Principle" [8th of 7, Nov 16 2020]

[link]






       If the wall fixing had a small amount of a gamma-emitting nuclide like Cobalt-60 or Strontium-90 embedded* in it, then a piece of radioflourescent plastic applied to the front of the item to be hung would show a visible glowing spot as it moved over the fixing; the radiation will penetrate the material and give you an exact positioning cue, in X, Y and Z axes.   

       *You can't make the whole thing from them, as those metals have unsuitable mechanical properties.
8th of 7, Nov 16 2020
  

       "a small amount of Cobalt-60 or Strontium-90 ..."
-8th of 7, Nov 16 2020
  

       How about if the head of the hammer is contains a *barely* sub-critical amount of something like californium-252, and the nail-head insert was *just* the right extra amount...? Once you've nailed the fastener in, you won't need to hang anything else. Problem solved.
kdf, Nov 16 2020
  

       But in all seriousness - use a typical steel hanger. Glue a tiny rare-earth magnet on the back of your objet d'art where you think it needs to be as your "locator." It'll give a little tug when you've positioned it correctly.   

       In bulk these things cost pennies a piece. I have a lot of them around the house and constantly find new applications for them.
kdf, Nov 16 2020
  

       // constantly find new applications for them. //   

       [kdf], you need to get out more and meet other humans.   

       Coming from us, that advice should worry you. Lots.
8th of 7, Nov 16 2020
  

       Hey, I'm not the one who suggested a Theremin-gy picture hanger... go pick on Ray.
kdf, Nov 16 2020
  

       That's no fun, he's more deserving of pity than condemnation. The whole idea has a flavour of Scott Adams' "Engineers Explained" about it ... he actually mentions picture-hanging. <link>
8th of 7, Nov 16 2020
  

       Oh, all right. But I'm still disappointed that you didn't remark on the sub-critical nuclear hammer idea...
kdf, Nov 16 2020
  

       Aw, we did that three Saturnalias ago, with the Intercalary's novelty nutcracker. Oh, how we laughed ...
8th of 7, Nov 16 2020
  

       Pictures or it never happened.
kdf, Nov 16 2020
  

       I have rare-earth magnets holding up a piece of finish trim wood on my basement ceiling. As the area was in front of a crawl window and hiding water pipes, a gas line, a cable or two, and the Case-Western ARPAnet trunk line, removable access was important.
RayfordSteele, Nov 17 2020
  

       Murphy's law, it will find that nail/screw that missed and was plastered over without removal.
wjt, Nov 21 2020
  
      
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