3D object representing a cardioid, a very common curve in mathematics, defined by an equation. It was obtained by 3D printing from computer models. The cardioid often appears in the morning in our bowl of coffee with milk. It is here engendered by the method of nails and threads. Then, to get a 3D object, the wires are replaced by circles. According to one of the axes, the projection of the sculpture thus obtained restores the basic construction. But it acquires its sphericity.