The “heart of the forest” pulsating effect is produced using an array of microscopic cubes that are positioned in such a way that they reflect light back to the viewer, creating the illusion of a shifting and never-ending view. This novel effect was achieved on the master tooling by using advanced laser engraving technology. Traditional engraving is no longer limited to millimetres-it is now possible to achieve engraved details as small as 0.02 mm. Mintage is limited to just 8,000 coins.