Half a croissant, on a plate, with a sign in front of it saying '50c'
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The phrase 'crumpled heap' comes to mind.

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Wall Soundproofing Water-Absorbent Draperies

Glue sorbent plastic sheets to your walls and pour water on them
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A curse of cheap apartment housing is thin walls that fail to attenuate, let alone block, sound.

Good sound absorbance typically requires adding mass, which is difficult and expensive (e.g. bricks, additional layers of sheetrock on sound isolating standoff blocks, etc.).

Fast and cheap sound absorbance could (in theory) be done like so:

A sheet of water absorbing polymer the size of the wall, with waterproof plastic sheet on both sides, adhesive on one side, and a hose port at one corner.

Receive by mail-order, unroll it, stick it to the wall, and connect a garden hose from the nearest faucet to fill it with water.

Result: a ~6 inch thick layer of waterlogged plastic material stuck to the wall and covering the entire surface of the wall, weighing perhaps a ton, and attenuating sound perhaps by a lot, since the sound waves dissipate in the mass of heavy damp plastic.

Not recommended for ceilings, floors, vent openings, doors, or lightly built walls. Not to be installed without stamped architectural drawings approved by the planning office.

sninctown, May 28 2020

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       Absolutely guaranteed to pull your drywall off on the way to killing your dog and crushing your new TV set. [+]
Voice, May 28 2020
  

       Poor dog. The rest of the destruction is cool though. [+]
doctorremulac3, May 28 2020
  

       ... or roc eggs.
pertinax, May 29 2020
  

       //bellows// or rotary (fan) speakers.   

       Water conducts sound very well, so are you sure this would work as described?
pocmloc, May 29 2020
  

       // are you sure this would work as described?   

       Not particularly.   

       I would hope the density changes around particles of plastic would rapidly scatter and dissipate the sound waves, but until someone actually builds this (however short-lived that may be) I have no idea.
sninctown, May 29 2020
  

       Water conducts sound well, but I would think a gelatinous distortable bag of it wouldn't do so well. The physics here seem interesting.
RayfordSteele, May 29 2020
  

       A thin-film reflection material for sound waves. The plastic could be a 1/2-wavelength delay plate. Maybe.
sninctown, May 29 2020
  

       An apartment with the new tent look.   

       Water capacitance as boundary walls? Usually water in walls is actively avoided and different materials and tanking are used if done. Plastic might condense/trap moisture. Don't want free mushrooms growing from the skirting boards.
wjt, Jun 01 2020
  

       No, no, they're all good. It is just the farm maintenance that's overly costly.
wjt, Jun 01 2020
  

       Venn diagrams of who/what pays.
wjt, Jun 02 2020
  

       Bit of O2, bit of air cleaning, a patch of living space and the feel good buzz. A lot of tiny green profits.
wjt, Jun 04 2020
  

       Darn, I was just about to inquire about the ceiling version. Shucks. Darn.
blissmiss, Jun 04 2020
  

       Got up lights/LEDS with growing frequencies? Also the herb plant's penetrating roots would have to be sealed by the ceiling drape unless it was in the bathroom.
wjt, Jun 05 2020
  

       I once went to a cafe where one wall had a holey tube running along the top, and a trough at the bottom, so that water flowed continuously down the wall. There were lots of ferns and mosses growing on the wall.
pocmloc, Jun 05 2020
  

       Hot climate? Did the cafe have a better relaxed vibe?
wjt, Jun 06 2020
  
      
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