The Mystic Island based on the level 3 cluster made of 7 'Spectre' level 2 clusters [L'île du Mystique basée sur le 'cluster' de niveau 3 constitué de 7 'cluster's de niveau 2 de 'Spectre's].
The discovery of the "EinStein" tiling of the plane by means of the "Spectre" monotile is due to
David Smith, Joseph Samuel Myers, Craig Kaplan and Chaim Goodmann-Strauss (05/2023).