The level-1 cluster made of 9 'Spectre' tiles with display of all the key-points making quadrilaterals (8 red small and a green big one) [Le 'cluster' de niveau-1 constitué de 9 pavés 'Spectre's avec visualisation des points-clefs regroupés en quadrilatères (8 petits rouges et un grand vert)].

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).

See some related pictures (including this one):


See the used random color set.

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