Half a croissant, on a plate, with a sign in front of it saying '50c'
h a l f b a k e r y
This would work fine, except in terms of success.

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Visible Sound

Sound wave pattern statue
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Put some quick drying slurry in a vibrating pan and play a sound with a really pretty pattern -- the slurry will dry in the shape of the sound wave.
JesusHChrist, Nov 14 2005

Chladni Figures... http://www.physics....ves/demo/3d4030.htm
...are very much to do with the sound wave that produces them. [Wrongfellow, Feb 10 2012]

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       Those are not sound waves; Those are stationary waves.
VJW, Feb 10 2012
  

       as [VJW] said - that pattern is nothing to do with the sound wave - it's dependent on the viscosity of the liquid and the shape of the container
hippo, Feb 10 2012
  
      
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