The 'Mystic' made of two 'EinStein' aperiodic 'Spectre' tiles [Le 'Mystique' fait de deux pavés 'Spectre' apériodiques 'EinStein'].
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).