The Attunement Structure is crafted from the biological material of the Workshop itself, and uses special resonance with Shards to communicate with the alternate reality of the Mirror Islands, which are brimming with Ethereal Elemental energies. Cooperative critters called Meebs are recruited to 'attune themselves' to the energy of a given Mirror Island, and to pass off that attunement to aid in the creation of new Ethereal hybrids via Synthesis. Take care: the Structure's resonance with each of the Mirror Islands varies from day to day, so some energies are more costly to collect at certain times than others.