These chairs are made using the technology of 3D-printing (some would say was printing using special 3D-printers). But there is another unusual feature, and - relief on the chairs repeats the noise of the cities. So it turns out that two identical patterns can never be - even the same noise source (in this case a city) at different times sounds different. On the relief will affect the volume and frequency of sounds. Brazilians have come up with such furniture - designers from Estudio Guto Nequena. Incoming search terms: ikea corner chaise chair