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Sound enhancer made from regular cellphone package. In making process, just by adding a few perforation cuts (No more material added = same, or nearly same price of the box) there could be a sound enhancer (eg speaker), so you eventually can use your phone box for anything else than catching the dust. Use your fingers to rip perforation lines, and push the panel to the back to make a simple sound "tunnel".
Taipei Tech university
Taipei city, Taiwan