Half a croissant, on a plate, with a sign in front of it saying '50c'
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Water Pipe

A musical instrument of glass, that when sucked, blown and hit, reverberates pleasantly.
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Take a long thick tube of glass such as a large test tube. Half-fill it with water. Insert a straw and affix it to the bottom. By sucking or blowing into the straw, one lowers or raises the level, and striking the side will cause a higher or lower tone. With the correct glass thickness and edge, a moist fingertip drawn around the rim can also produce music.

With markings for notes, this might make an educational and fun instrument for children.

FarmerJohn, Dec 30 2002

Only sorta related but the idea reminded me of this. http://www.glassarmonica.com/
Benjamin Franklin invention [half, Oct 04 2004, last modified Oct 21 2004]

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       [farmer] the UK needs an overflow pipe badly at present. croissant for a lovely new instrument for children. (instrument of torture for parents and teachers, mebbe)
po, Dec 30 2002
  

       not sewage, just has not stopped raining like for ever.   

       I was going to post an idea for an over flow pipe and then I thought some smart ass (ahem, UB) would say - rivers.
po, Dec 30 2002
  

       Where I live a “thongophone” would be a phone where you talk into a..... never mind.   

       Nice idea FJ.
Shz, Dec 30 2002
  
      
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