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

Fits in your backpack, talk with your friends privately in public, protected by a layer of water.
  [vote for,

Simply an inflatable sphere-like structure, which can be filled with water from a tap, and put on your head. It rests on top of your head, and closes at your neck. It has a microphone inside, and a window in front, so you can talk, and look at your computer screen, exchange smiles, but your voice is muted by a layer of water.

When you don't need it, just let the water out, and put it back into your backpack.

Inyuki, Aug 03 2012

The Sound Insulation of Water http://www.levelaco...kers%20et%20all.pdf
A paper that "presents a noise barrier that implemented the multilayer membranes filled with water" (R.H.C. Wenmaekers, B.A. van der Aa, A.D.C. Pronk, A. Couthinho, L.C.J. van Luxemburg) [Inyuki, Aug 03 2012]

No surprises http://youtu.be/2Lnltl3YoqQ
for guessing what youtubery this is [calum, Aug 06 2012]


       anything that puts odd helmets on people gets my vote [+]
FlyingToaster, Aug 03 2012

       Hey, thanks, [FlyingToaster]! It's nice there are poeple who like oddities!
Inyuki, Aug 03 2012

       We leave the trivial calculation of the typical mass of such a device to the reader ...   

       Volume of a sphere: 1.33 x pi x r^3   

       You may assume that the value of rho for water is 1.
8th of 7, Aug 03 2012

       [7/8ths] the mass of the helmet depends on the thickness of the water layer. I infer that is meant to consist of a pair of concentric shells, with the interstice filled with water.
MaxwellBuchanan, Aug 03 2012

       It would make a pleasing place in which to keep fish...
bs0u0155, Aug 03 2012

       You could call it a Wearquarium... or a Think Tank...
bs0u0155, Aug 03 2012

       For a sphere of 500mm internal diameter, and 550mm external diameter, with negligibly thick walls, and neglecting the neck hole, the volume between the two spheres is about 55l.   

       That's 55 kg.   

       That's a LOT to support on your neck and shoulders, unless you care to invest in a BorgCo Mobile Water Helmet Support Frame.
8th of 7, Aug 03 2012

       You forgot a factor of pi in there.   

       A sphere 30cm in diameter with a 1cm layer of water would weigh in at a nimble 3kg.   

       Plus you could keep thin fish in it.
MaxwellBuchanan, Aug 03 2012

       Snow dome.
AusCan531, Aug 03 2012

       I think the weight of the water on the head would be comforting.
tatterdemalion, Aug 03 2012

       any weight could be offset in a simple and convenient manner by attaching a large helium balloon to the top. This would add grace&style to an already gracious and stylish idea.
bs0u0155, Aug 03 2012

       You could also introduce helium into the interior of the helmet, which would have the added benefit of further confounding any adversary who's attempting to listen to your voice.
Wrongfellow, Aug 03 2012

       // Wearquarium... or a Think Tank... //   

       Good suggestion!   

       // helium balloon to the top //   

       [bs0u0155], you made me laugh, really. Thanks.
Inyuki, Aug 03 2012

       Hear, hear...
not_morrison_rm, Aug 06 2012

       You could ditch the outer sphere layer, and have just the internal layer, with a spirally-wound electro-magnet, and use a magnetic fluid to get a sound deadening, yet spinky outer covering.   

       On the page from the "no surprises" link I was surprised to see another video title "Aurora Beltrán y Bunbury - Clases de baile". I was unaware that Bunbury-ism was still in use.
not_morrison_rm, Aug 06 2012


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