Fill it with warmth and watch it grow, literally. Oskar Zieta serves up this directive with this DIY wall peg. Instead of the FIDU technique using a compressor in the designer’s Poland studios, your very own oven breathes life into Hot Heart. It’s shipped flat-packed and sealed with a secret formula locked inside. At a temperature of 200C/392F, the heart fills and becomes a sculptural 3D wall hanger.