Made from recycled newspaper, they are entirely natural and sustainable. First the newspaper is mixed with water, then chalk and tree sap crystals are added to turn the substance into a clay-like material. The pulp is kneaded into chapati-like forms, then rolled and moulded into the sculptural hearts. There is no firing, no power used, and the process is entirely eco-friendly. Porous in nature, paper mache should not be exposed to liquids.