The cube is made from natural stone, a timeless material, just like love. Each side is 42 cm, so the cube is the perfect size: neither too large and obtrusive, nor too small and weak. On two opposite sides there are two thin, deep slits, each 3 mm wide. At first glance, the slits are disconnected. They are designed to fit two sheets of paper (or leather or thin wood) for the lovers to write their love messages on. The internal design of the cube allows the two sheets to meet inside and thus become one with each other. Once the sheets are in, the cube is designed so that it is no longer possible to remove them.